A square of cardboard is taped at the perimeter by a piece of ribbon 20cm long. What is the area of the board?

After getting a rise of 15%, a man's new monthly salary is N345. How much per month did he earn before the increase?

The annul profits of a transport business were divided between the partners A and B in the ratio 3 : 5. If B received N3000 more than A, the total profit was

In base ten, the number 101101 (base 2) equals

In \(\bigtriangleup\)PQR, PQ = 10cm, QR = 8cm and RP = 6cm, the perpendicular RS is drawn from R to PQ. Find the length of RS

\((1.28 \times 10^{4}) \div (6.4 \times 10^{2})\) equals

If the value of \(\pi\) is taken to be \(\frac{22}{7}\), the area of a semi-circle of diameter 42m is

(3.2)2 - (1.8)2 equals

The mean of the numbers 1.2, 1.0, 0.9, 1.4, 0.8, 0.8, 1.2 and 1.1 is