Loading....

WAEC SSCE - General Mathematics - 2009 (Objective)

Question 1 Report

In an examination, Kofi scored x% in Physics, 50% in Chemistry and 70% in Biology. If his mean score for the three subjects was 55%, find x
Answer Details
Kofi's mean score for the three subjects was 55%, so the total percentage score for the three subjects is 3 x 55 = 165%. Let's assume that Kofi scored x% in Physics. Then, the total percentage score for Physics, Chemistry and Biology would be: x + 50 + 70 = 165 Simplifying the equation, we get: x = 165 - 50 - 70 x = 45 Therefore, Kofi scored 45% in Physics. So the correct option is (B) 45.
Read lesson note on Change Of Subject Of A Formula/Relation (WAEC)
Read lesson note on Modular Arithmetic (WAEC)
View Answer