GMAT
题目
Life expectancy is defined by the formula , where S = shoe size, B = average monthly electric bill in dollars, and G = GRE score. If Melvin’s GRE score is twice his monthly electric bill, and his life expectancy is 50, what is his shoe size?
解析
预期寿命由公式 \(\frac{2SB}{G}\) 定义，其中 \(S\) 代表鞋码，\(B\) 代表每月平均电费（单位：美元），\(G\) 代表GRE成绩。
如果梅尔文的GRE成绩是他每月电费的两倍：
=> \(G = 2B\)
他的预期寿命是50，他的鞋码是多少？
\[
50 = \frac{2SB}{2B} = S
\]
=> \(S = 50\)
所以，答案是D。
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