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Question

The average (arithmetic mean) of t and y is 15, and the average of w and x is 15. What is the average of t,w,x and y?

A
7.5
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B
15
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C
22.5
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D
30
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Solution

The correct option is B 15
Given, Average of t and y = 15
t + y2 = 15
t + y = 15 × 2
t + y = 30

Average ofw and x = 15
w + x2 = 15
w + x = 15 × 2
w + x = 30
Now, average of t, y, w and x = (t + y + w + x)4
= (t + y) + (w + x)4
= 30 + 304
= 604
= 15
Therefore, average of t, y, w and x is 15.

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