WAEC SSCE - General Mathematics - 2016 (Objective)

Question 1 Report

Express 1975 correct to 2 significant figures

1,900

1,980

2,000

Answer Details

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Fractions, Decimals And Approximations

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Question 2 Report

A fair die is thrown two times. What is the probability that the sum of the scores is at least 10?

$\frac{5}{36}$

$\frac{1}{6}$

$\frac{5}{18}$

$\frac{2}{3}$

Answer Details

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Probability

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Question 3 Report

A bag contains 5 red and 4 blue identical balls. Id two balls are selected at random from the bag, one after the other, with replacement, find the probability that the first is red and the second is blue

$\frac{2}{9}$

$\frac{5}{18}$

$\frac{20}{81}$

$\frac{5}{9}$

Answer Details

When two balls are drawn from the bag with replacement, there are a total of $9\times9=81$ possible outcomes, since there are 9 balls in the bag and we are replacing each ball after drawing. To find the probability that the first ball is red and the second ball is blue, we can use the multiplication rule of probability. The probability that the first ball is red is $\frac{5}{9}$, since there are 5 red balls out of 9 total balls in the bag. After replacing the first ball, there are still 9 balls in the bag, but now 4 of them are blue. So the probability that the second ball is blue, given that the first ball was red, is $\frac{4}{9}$. Therefore, the probability that the first ball is red and the second ball is blue is: $$\frac{5}{9} \times \frac{4}{9} = \frac{20}{81}$$ Hence the answer is $\frac{20}{81}$.

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Probability

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Question 4 Report

The figure is a pie chart which represents the expenditure of a family in a year. If the total income of the family was Le 10,800,000.00, how much was spent on food?

Le 2,250,000.00

Le 22,700,000.00

Le 3,600,000.00

Le 4,500,000.00

Answer Details

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Representation Of Data

Percentages

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Question 5 Report

A straight line passes through the point P(1,2) and Q
(5,8). Calculate the length PQ

$4\sqrt{11}$

$4\sqrt{10}$

$2\sqrt{17}$

$2\sqrt{13}$

Answer Details

We can use the distance formula to find the length PQ, which is the distance between points P and Q on the line. The distance formula is: distance = $\sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}$ where (x1, y1) = P and (x2, y2) = Q. Plugging in the values: distance = $\sqrt{(5-1)^2 + (8-2)^2}$ = $\sqrt{16 + 36}$ = $\sqrt{52}$ = $2\sqrt{13}$ Therefore, the length PQ is $2\sqrt{13}$. Answer: $2\sqrt{13}$.

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Loci

Circles

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Question 6 Report

The curve surface area of a cylinder, 5cm high is 110cm ². Find the radius of its base. [Take $\pi = \frac{22}{7}$]

2.6cm

3.5cm

3.6cm

7.0cm

Answer Details

The curved surface area of a cylinder is given by the formula: 2$\pi$rh. Given that the cylinder is 5cm high and its curved surface area is 110cm², we can write: 2$\pi$rh = 110, where h = 5 Substituting the value of $\pi = \frac{22}{7}$ and h = 5, we get: 2 x $\frac{22}{7}$ x r x 5 = 110 Simplifying this expression, we get: r = $\frac{7}{2}$ r = 3.5cm (to one decimal place) Therefore, the radius of the cylinder is approximately 3.5cm. Hence, the answer is 3.5cm.

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Mensuration

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Question 7 Report

An object is 6m away from the base of a mast. If the angle of depression of the object from the top of the mast is 50^o, find, correct to 2 decimal places, the height of the mast.

8.60m

7.83m

7.51m

7.15m

Answer Details

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Angles Of Elevation And Depression

Coordinate Geometry

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Question 8 Report

Halima is n years old. Her brother's age is 5 years more than half of her age. How old is her brother?

$\frac{n}{2} + \frac{5}{2}$

$\frac{n}{2}$ - 5

5 - $\frac{n}{2}$

$\frac{n}{2}$ + 5

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Number Bases

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Question 9 Report

If cos $\theta$ = x and sin 60^o = x + 0.5 0^o < $\theta$ < 90^o, find, correct to the nearest degree, the value of $\theta$

32^o

40^o

60^o

69^o

Answer Details

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Introductory Calculus

Circles

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Question 10 Report

Simplify:($\frac{10\sqrt{3}}{\sqrt{5}} - \sqrt{15}$)²

75.00

15.00

8.66

3.87

Answer Details

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Sets

Surds (radicals)

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Question 11 Report

The marks of eight students in a test are: 3, 10, 4, 5, 14, 13, 16 and 7. Find the range

Answer Details

The range of a set of data is the difference between the maximum and minimum values in the set. In this case, the minimum mark is 3 and the maximum mark is 16. Therefore, the range is 16 - 3 = 13. Hence, the answer is 13.

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Linear Inequalities

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Question 12 Report

In the diagram, TX is perpendicular to UW, |UX| = 1cm and |TX| = |WX| = $\sqrt{3}$cm. Find UTW

135^o

105^o

75^o

60^o

Answer Details

Using Pythagoras theorem, we can find that |UW| = 2cm. Next, we notice that $\Delta$UTW is an isosceles triangle since |TX| = |WX|. Therefore, o. Using the fact that the angles in a triangle add up to 180^o, we can find that o - o - (60^o + o. Therefore, we can substitute this into the previous equation to get: 90^o + o - (60^o + o = 2o, and since $\Delta$UTW is an isosceles triangle, we have that o. Hence, the answer is (C) 75^o.

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Circles

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Question 13 Report

In the diagram, PR||SV||WY|, TX||QY|, < PQT = 48^o and < TXW = 60^o.Find < TQU.

120^o

108^o

72^o

60^o

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Question 14 Report

In the diagram, O is the centre of the circle, < XOZ = (10cm)^o and < XWZ = m^o. Calculate the value of m.

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Circles

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Question 15 Report

Simplify: ($\frac{3}{4} - \frac{2}{3}$) x 1$\frac{1}{5}$

$\frac{1}{60}$

$\frac{5}{72}$

$\frac{1}{10}$

1$\frac{7}{10}$

Answer Details

To simplify the expression ($\frac{3}{4} - \frac{2}{3}$) x 1$\frac{1}{5}$, we first need to evaluate the subtraction inside the parentheses: \begin{align*} \frac{3}{4} - \frac{2}{3} &= \frac{9}{12} - \frac{8}{12} \\ &= \frac{1}{12} \end{align*} So now we have: \begin{align*} (\frac{3}{4} - \frac{2}{3})\times 1\frac{1}{5} &= \frac{1}{12} \times \frac{6}{5} \\ &= \frac{1 \times 6}{12 \times 5} \\ &= \frac{1}{10} \end{align*} Therefore, the answer is $\frac{1}{10}$.

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Question 16 Report

If 20(mod 9) is equivalent to y(mod 6), find y.

Answer Details

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Sets

Modular Arithmetic

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Question 17 Report

Find the values of y for which the expression $\frac{y^2 - 9y + 18}{y^2 + 4y - 21}$ is undefined

6, -7

3, -6

3, -7

-3, -7

Answer Details

The given expression will be undefined when its denominator is equal to zero since division by zero is undefined. So we need to find the values of y that make the denominator zero. \begin{align*} y^2 + 4y - 21 &= 0\\ (y+7)(y-3) &= 0 \end{align*} The denominator is equal to zero when either y+7=0 or y-3=0. Therefore, the expression is undefined when y=-7 or y=3. So, the answer is (c) 3, -7.

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Algebraic Fractions

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Question 18 Report

Simplify $\frac{(p - r)^2 - r^2}{2p^2 - 4pr}$

$\frac{1}{2}$

p - 2r

$\frac{1}{p - 2r}$

$\frac{2p}{p - 2r}$

Answer Details

First, let's simplify the numerator: \begin{align*} (p-r)^2 - r^2 &= (p^2 - 2pr + r^2) - r^2 \\ &= p^2 - 2pr \end{align*} Now, let's factor the denominator: \begin{align*} 2p^2 - 4pr &= 2p(p - 2r) \end{align*} Substituting these results, we get: \begin{align*} \frac{(p-r)^2 - r^2}{2p^2 - 4pr} &= \frac{p^2 - 2pr}{2p(p - 2r)} \\ &= \frac{p(p-2r)}{2p(p-2r)} \\ &= \frac{1}{2} \end{align*} Therefore, the answer is: \boxed{\frac{1}{2}}.

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Simple Operations On Algebraic Expressions

Quadratic Equations

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Question 19 Report

Factorize; (2x + 3y)² - (x - 4y)²

(3x - y)(x + 7y)

(3x + y)(2x - 7y)

(3x + y)(x - 7y)

(3x - y)(2x + 7y)

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Algebraic Expressions

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Question 20 Report

Simplify; $\frac{3^{n - 1} \times 27^{n + 1}}{81^{n}}$

3²ⁿ

3ⁿ

3^{n + 1}

Answer Details

We can simplify this expression by using the properties of exponents and simplifying the numbers. First, we can write 27 as 3³ and 81 as 3⁴. Next, we can simplify the numerator by using the distributive property of exponents: \begin{align*} \frac{3^{n-1} \times 27^{n+1}}{81^n} &= \frac{3^{n-1} \times 3^{3(n+1)}}{3^{4n}} \\ &= \frac{3^{n-1} \times 3^{3n+3}}{3^{4n}} \\ &= \frac{3^{4n-1}}{3^{4n}} \times 3^{3n+3} \\ &= 3^{-1} \times 3^{3n+3} \\ &= 3^{3n+2} \\ &= 3^2 \times 3^{3n} \\ &= 9 \times 3^n \\ \end{align*} Therefore, the simplified expression is 9 * 3ⁿ. So, the answer is 9.

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Number Bases

Modular Arithmetic

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Question 21 Report

Simplify; $\frac{2}{1 - x} - \frac{1}{x}$

$\frac{x + 1}{x(1 - x)}$

$\frac{3x - 1}{ x(1 - x)}$

$\frac{3x + 1}{ x(1 - x)}$

$\frac{x + 1}{ x(1 - x)}$

Answer Details

To simplify the expression $\frac{2}{1-x} - \frac{1}{x}$, we need to first find a common denominator. The denominator of the first fraction is $(1-x)$ and the denominator of the second fraction is $x$. The common denominator of these two fractions is $x(1-x)$. Now, we need to rewrite each fraction with this common denominator. For the first fraction, we can multiply the numerator and denominator by $x$, giving us $\frac{2x}{x(1-x)}$. For the second fraction, we can multiply the numerator and denominator by $(1-x)$, giving us $\frac{-(1-x)}{x(1-x)}$. Putting these two fractions together, we get: \[\frac{2x}{x(1-x)} - \frac{1-x}{x(1-x)} = \frac{2x - (1-x)}{x(1-x)} = \frac{3x-1}{x(1-x)}\] Therefore, the answer is $\frac{3x-1}{x(1-x)}$.

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Algebraic Fractions

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Question 22 Report

In the diagram, TS is a tangent to the circle at S. |PR| and < PQR = 177^o. Calculate < PST.

54^o

44^o

34^o

27^o

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Circles

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Question 23 Report

The perimeter of a sector of a circle of radius 21cm is 64cm. Find the angle of the sector [Take $\pi = \frac{22}{7}$]

70^o

60^o

55^o

42^o

Answer Details

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Question 24 Report

The relation y = x² + 2x + k passes through the point (2,0). Find the value of k

- 8

- 4

Answer Details

We know that the relation y = x² + 2x + k passes through the point (2,0), which means that when x=2, y=0. So, substituting these values in the relation, we get: 0 = 2² + 2(2) + k 0 = 4 + 4 + k 0 = 8 + k Therefore, k = -8. Hence, the value of k is -8.

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Solution Of Linear Equations

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Question 25 Report

Given that 2x + y = 7 and 3x - 2y = 3, by how much is 7x greater than 10?

Answer Details

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Solution Of Linear Equations

Algebraic Expressions

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Question 26 Report

A sphere of radius rcm has the same volume as cylinder of radius 3cm and height 4cm. Find the value of r

$\frac{2}{3}$

Answer Details

The volume of a sphere of radius r is given by the formula: $\frac{4}{3}\pi r^3$. The volume of a cylinder of radius 3cm and height 4cm is given by the formula: $\pi (3cm)^2(4cm) = 36\pi cm^3$. According to the question, the volume of the sphere is equal to the volume of the cylinder. Therefore: \[\frac{4}{3}\pi r^3 = 36\pi\] Dividing both sides by $\frac{4}{3}\pi$, we get: \[r^3 = 27\] Taking the cube root of both sides, we get: \[r = 3\] Therefore, the value of r is 3cm. Answer is correct.

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Volumes

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Question 27 Report

A straight line passes through the points P(1,2) and Q(5,8). Calculate the gradient of the line PQ

$\frac{3}{5}$

$\frac{2}{3}$

$\frac{3}{2}$

$\frac{5}{3}$

Answer Details

The gradient of a line is the measure of its steepness, or slope. To find the gradient of the line PQ, we need to use the formula: Gradient (m) = change in y / change in x We can calculate the change in y by subtracting the y-coordinate of point P from the y-coordinate of point Q: 8 - 2 = 6 Similarly, we can calculate the change in x by subtracting the x-coordinate of point P from the x-coordinate of point Q: 5 - 1 = 4 Therefore, the gradient of the line PQ is: Gradient (m) = change in y / change in x = 6 / 4 = 3/2 Therefore, the answer is option C: $\frac{3}{2}$.

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Graphs Of Linear And Quadratic Functions

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Question 28 Report

The distance, d, through which a stone falls from rest varies directly as the square of the time, t, taken. If the stone falls 45cm in 3 seconds, how far will it fall in 6 seconds?

90cm

135cm

180cm

225cm

Answer Details

The problem can be solved using the formula for direct variation: d = kt^2 where d is the distance, t is the time, and k is the constant of variation. We can solve for k using the given information that the stone falls 45cm in 3 seconds: 45 = k(3)^2 45 = 9k k = 5 Now that we know k, we can use the formula to find how far the stone will fall in 6 seconds: d = 5(6)^2 d = 5(36) d = 180cm Therefore, the answer is 180cm.

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Variation

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Question 29 Report

On a map, 1cm represent 5km. Find the area on the map that represents 100km².

2cm²

4cm²

8cm²

20cm 2

Answer Details

If 1cm represents 5km on the map, then x cm will represent 100km² on the map. To find x, we can use the formula for area of a square, which is A = s². In this case, we want to solve for s, where A = 100 and s represents the side length on the map in centimeters. So, s² = A s² = 100 s = √100 s = 10cm Therefore, 10cm on the map represents 100km² on the ground. To find the area on the map that represents 100km², we need to find the area of a square with a side length of 10cm. Area = s² Area = 10cm x 10cm Area = 100cm² So, the area on the map that represents 100km² is 100cm², which is equal to 1cm x 1cm, 4cm², or.

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Volumes

Areas

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Question 30 Report

In the diagram MN is a chord of a circle KMN centre O and radius 10cm. If < MON = 140^o, find, correct to the nearest cm, the length of the chord MN.

19cm

18cm

17cm

12cm

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Circles

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Question 31 Report

What sum of money will amount to D10,400 in 5 years at 6% simple interest?

D8,000.00

D10,000.00

D12,000.00

D16,000.00

Answer Details

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Representation Of Data

Modular Arithmetic

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Question 32 Report

$\begin{array}{c|c}
Age(years) & 13 & 14 & 15 & 16 & 17 \\
\hline
Frequency & 10 & 24 & 8 & 5 & 3
\end{array}$
Find the median age

Answer Details

To find the median, we need to first arrange the ages in order from lowest to highest. Then, we can determine which age lies in the middle of the list. Arranging the ages in order of increasing magnitude, we have: $$13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17, 17, 17$$ There are a total of 10+24+8+5+3 = 50 ages in the list, which is an even number. To find the median, we need to take the average of the two middle ages. The two middle ages are the 25th and 26th ages in the list, which are both 14. Therefore, the median age is: $$(14 + 14)/2 = 14$$ So the correct answer is 14.

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Integration

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Question 33 Report

Kweku walked 8m up to slope and was 3m above the ground. If he walks 12m further up the slope, how far above the ground will he be?

4.5m

6.0m

7.5m

9.0m

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Algebraic Expressions

Lengths And Perimeters

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Question 34 Report

The roots of a quadratic equation are $\frac{4}{3}$ and -$\frac{3}{7}$. Find the equation

21x² - 19x - 12 = 0

21x² + 37x - 12 = 0

21x² - x + 12 = 0

21x² + 7x - 4 = 0

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Quadratic Equations

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Question 35 Report

Find the lower quartile of the distribution illustrated by the cumulative frequency curve

17.5

19.0

27.5

28.0

Answer Details

To find the lower quartile, we need to identify the point on the cumulative frequency curve that corresponds to 25% of the total frequency. From the graph, we see that the total frequency is 40, and 25% of this is 10. The point on the curve that corresponds to a frequency of 10 is at a value of 19.0. Therefore, the lower quartile is 19.0. Note that the cumulative frequency curve shows the cumulative frequency of data values up to and including each data point on the horizontal axis. So, we can read off quartiles and other percentiles directly from the graph.

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Matrices And Determinants

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Question 36 Report

If 23_x + 101_x = 130_x, find the value of x

Answer Details

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Number Bases

Sets

Modular Arithmetic

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Question 37 Report

In the diagram, O is the centre of the circle, < QPS = 100^o, < PSQ = 60^o and < QSR. Calculate < SQR

20^o

40^o

60^o

80^o

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Circles

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Question 38 Report

$\begin{array}{c|c}
Age(years) & 13 & 14 & 15 & 16 & 17 \\
\hline
Frequency & 10 & 24 & 8 & 5 & 3
\end{array}$

The table shows the ages of students in a club. How many students are in the club?

Answer Details

To find out how many students are in the club, we need to add up the frequencies in the table. So, Number of 13-year-olds = 10 Number of 14-year-olds = 24 Number of 15-year-olds = 8 Number of 16-year-olds = 5 Number of 17-year-olds = 3 Total number of students = 10 + 24 + 8 + 5 + 3 = 50 Therefore, there are 50 students in the club.

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Linear Inequalities

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Question 39 Report

The diagram, MOPQ is a trapezium with QP||MO, MQ||NP, NQ||OP, |QP| = 9cm and the height of $\Delta$ QNP = 6cm, calculate the area of the trapezium.

96cm²

90cm²

81cm²

27cm²

Answer Details

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Circles

Indices

Number Bases

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Question 40 Report

Which of following is a valid conclusion from the premise. "Nigeria footballers are good footballers"?

Joseph plays football in Nigeria therefore he is a good footballer

Joseph is a good footballer therefore he is a Nigerian footballer

Joseph is a Nigerian footballer therefore he is a good footballer

Joseph plays good football therefore he is a Nigerian footballer

Answer Details

The valid conclusion from the premise "Nigeria footballers are good footballers" is "Joseph is a Nigerian footballer therefore he is a good footballer". This is because the premise establishes that Nigeria footballers are good, so anyone who is a Nigeria footballer can be inferred to be a good footballer. Therefore, Joseph, who is a Nigerian footballer, can be concluded to be a good footballer. The other options are not valid because they do not follow logically from the given premise.

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Logical Reasoning

Sequence And Series

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Question 41 Report

If log₂(3x - 1) = 5, find x.

2.00

3.67

8.67

Answer Details

We are given that log₂(3x - 1) = 5. Using the definition of logarithms, we know that 2⁵ = 32 is equal to the expression inside the logarithm. That is, 3x - 1 = 32 Adding 1 to both sides, we get 3x = 33 Dividing by 3, we get x = 11 Therefore, the value of x is 11. Answer: 11.

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Logarithms

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Question 42 Report

Examine M' $\cap$ N from the venn diagram

{f, g}

{e}

{e, f}

{e, f, g}

Answer Details

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Number Bases

Sets

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Question 43 Report

Make s the subject of the relation: P = S + $\frac{sm^2}{nr}$

s = $\frac{mrp}{nr + m^2}$

s = $\frac{nr + m^2}{mrp}$

s = $\frac{nrp}{mr + m^2}$

s = $\frac{nrp}{nr + m^2}$

Answer Details

To make s the subject of the relation P = S + $\frac{sm^2}{nr}$, we need to isolate s on one side of the equation. First, we can start by moving the $\frac{sm^2}{nr}$ term to the other side of the equation by subtracting it from both sides: P - $\frac{sm^2}{nr}$ = S Next, we can solve for s by multiplying both sides of the equation by $\frac{nr}{m^2}$: s = $\frac{nr}{m^2}$(P - $\frac{sm^2}{nr}$) Simplifying the right-hand side, we get: s = $\frac{nrp}{m^2}$ - $\frac{s}{m}$ To isolate s, we can add $\frac{s}{m}$ to both sides of the equation: s + $\frac{sm}{m^2}$ = $\frac{nrp}{m^2}$ Simplifying the left-hand side, we get: s($\frac{m + 1}{m^2}$) = $\frac{nrp}{m^2}$ Finally, we can solve for s by dividing both sides of the equation by $\frac{m+1}{m^2}$: s = $\frac{nrp}{nr + m^2}$ Therefore, the answer is s = $\frac{nrp}{nr + m^2}$.

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Change Of Subject Of A Formula/Relation

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Question 44 Report

In the diagram, $\bar{PF}$, $\bar{QT}$, $\bar{RG}$ intersect at S and PG||RG. If < SPQ = 113^o and < RSt = 220, find < PSQ

22^o

45^o

67^o

89^o

Answer Details

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Question 45 Report

The ratio of the exterior angle to the interior angle of a regular polygon is 1:11. How many sides has the polygon?

Answer Details

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Question 46 Report

In the diagram, $\bar{YW}$ is a tangent to the circle at X, |UV| = |VX| and < VXW = 50o. Find the value of < UXY.

70^o

80^o

105^o

110^o

Answer Details

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Circles

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Question 47 Report

Find the next three terms of the sequence; 0, 1, 1, 2, 3, 5, 8...

13, 19, 23

9, 11, 13

11, 15, 19

13, 21, 34

Answer Details

The given sequence is the Fibonacci sequence, where the first two terms are 0 and 1, and each subsequent term is the sum of the two preceding it. Therefore, the next three terms are: - 13 (8 + 5) - 21 (13 + 8) - 34 (21 + 13) Hence, the answer is 13, 21, 34.

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Sequence And Series

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Question 48 Report

The volume of a pyramid with height 15cm is 90cm³. If its base is a rectangle with dimension xcm by 6cm, find the value of x

Answer Details

The formula for the volume of a pyramid is given as: V = (1/3) * base_area * height Let the length of the rectangle be x, then the base area of the pyramid is given as: base_area = x * 6 From the question, we are told that the volume of the pyramid is 90cm³ and its height is 15cm. Substituting into the formula for the volume of a pyramid, we have: 90 = (1/3) * (x * 6) * 15 Multiplying both sides by 3 gives: 270 = 90 * 6x Dividing both sides by 90 gives: 3 = 2x Therefore, x = 3/2 = 1.5 Hence, the value of x is 3. Answer option A, 3, is the correct answer.

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Question 49 Report

From the diagram, which of the following is true?

m + n + p = 180^o

m + n = 180^o

m = p + n

n = m + p

Answer Details

Read lesson note on Angles And Intercepts On Parallel Lines (WAEC)

Read lesson note on Angles (WAEC)

Angles And Intercepts On Parallel Lines

Angles

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