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标题: gwd-9-24 [打印本页]

作者: assfgrtrtr 时间: 2004-12-19 13:32 标题: gwd-9-24

Q24:

A certain fruit stand sold apples for $0.70 each and bananas for $0.50 each. If a customer

purchased both apples and bananas from the stand for a total of $6.30, what total number

of apples and bananas did the customer purchase?

A. 10

B. 11

C. 12

D. 13

E. 14

已经晕了，不是买9个苹果就6.3块了么？7只有乘以9后个位才会是3，苹果和香蕉一起买怎么也买不出6.3块啊？

作者: himba 时间: 2004-12-19 13:35

apple(0.7)banana(0.5)banana(0.5)Apple1x0.75.6/0.5=I , no1x0.55.8/0.7, no2x0.74.9/0.5=I, no2x0.55.3/0.7, no3x0.74.2/0.5, no3x0.54.8/0.7, no4x0.73.5/0.5, yes4x0.54.3/0.7, no5x0.72.8/0.5, no5x0.53.8/0.7, no6x0.72.1/0.5, no6x0.53.3/0.7, no7x0.71.4/0.5, no7x0.52.8/0.7, yes8x0.70.7/0.5, no8x0.52.3/0.7, no9x0.7yes, 9x0.51.8/0.7,no10x0.51.3/0.7, no11x0.50.8/0.7, noSo, 11 is the only possible answer.

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