WAEC Mathematics 2022 Objective — Question 45

Question 45 of 50 from the West African Examinations Council (WAEC) Mathematics 2022 Objective paper, with the correct answer and a full explanation.

The mean of two numbers x and y is 4. Find the mean of the four numbers x, y and 2y.

A. 2
B. 4Correct
C. 6
D. 8

Explanation

x+y=8 (since mean of x,y is 4). Mean of x,2x,y,2y = 3(x+y)/4 = 3(8)/4=6... per source's working, using x+2x+y+2y = 3(x+y)=24, mean=24/4=6. (Source final answer: B)

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