作者chenemily (天天保持好心情)
看板juniorhigh
标题[问题] 请教一题数学
时间Tue Sep 15 12:08:52 2009
In May Mrs. Lee's earnings were 60 percent of the Lee family's total income.
In June Mrs. Lee earned 20 percent more than in May. If the rest of the
family's income was the same both months, then, in June, Mrs. Lee's earnings
were approximately what percent of the Lee family's total income?
我是设Lee全家所得为x, 则五月份Lee单所得 0.6x,
六月份Lee单所得为: 0.72x
请问哪里可知道 其他所得为0.4x
题目只说the rest of the family's income was the same both months
为什麽可以推得其他所得为0.4x
谢谢
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1F：推 pop88pop88:就 其他家庭成员两个月赚的总额一样多 09/15 12:52