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1. Given that w + x = - 4, x + y = 25 and y + w = 15, what is the average (arithmetic mean) of w, x and y?
- A. 36
- B. 36
- C. 36
- D. 36
Answer: Option D
Explanation:
w + x = - 4....(a)
x + y = 25....(b)
y + w = 15....(c)
(a) + (b) + (c)
2(x + y + z) = 36
= )x + y + z = 18
= )x + y + z/3 = 18/3
So x + y + z/3 = 6
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