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标题: 11th OG 237题 [打印本页]

作者: johncheng 时间: 2006-7-18 06:53 标题: 11th OG 237题

237. A part-time employee whose hourly wage was increased by 25 percent decide to reduce the number of hours worked per week so that the employee's total weekly income would remain unchanged. By what percent should the number of hours worked be reduced?

12.5% 20% 25% 50% 75%

Key is 20%

不会列方程，找不出足够的等量。也找不出该设哪个为未知数？

作者: winners 时间: 2006-7-19 07:11

设原来的工资为W，原来工作时间为T，工作时间减少了X%

则增加后的工资为1.25W，减少后的工作时间为T*（1-X%）

W * T = 1.25W * T*（1-X%）

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