推 pop88pop88:就 其他家庭成員兩個月賺的總額一樣多 09/15 12:52
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?
我是設Lee全家所得為x, 則五月份Lee單所得 0.6x,
六月份Lee單所得為: 0.72x
請問哪裡可知道 其他所得為0.4x
題目只說the rest of the family's income was the same both months
為什麼可以推得其他所得為0.4x
謝謝
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