If a + b = 3(c + d), which of the following is the average (arithmetic mean) of a, b, c, and d?
- 3(c + d)/8
- (c + d)/2
- 3(c + d)/4
- c + d
Explanation
a + b = 3(c + d)
We need to find the average of a, b, c, and d, which is:
(a + b + c + d) / 4
Substitute a + b from the given equation:
= [3(c + d) + c + d] / 4
= [4(c + d)] / 4
= c + d
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