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题目内容 (请给出正确答案)
单选题
The average of a, b, c, and d is p. If the average of a and c is q, what is the average of b and d in terms of p and q?
A

2p+q

B

2pq

C

2q +p

D

2q-p

E

(2p+q)/3


参考答案

参考解析
解析:
The average of a, b, c, and d is p, so (a + b + c + d)/4 = p, or a+b+c+d = 4p. Similarly, since the average of a and c is q, then a+c = 2q, so b+d+2q = 4p. Since b+d = 4p - 2q, then (b +d)/2 = 4p/2 - 2q/2 = 2pq.
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