Re: [問題] 請教一題數學
※ 引述《chenemily (天天保持好心情)》之銘言：
: 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,其他人的0.4x
六月份Lee單所得為: 0.6x*1.2=0.72x
因為the rest of the family's income was the "same" both months
其餘家人的收入 在這兩個月中都一樣的
所以在六月中其他家人的收入也是0.4x
0.72x+0.4x=1.12x
故答案為 0.72x / 1.12x=64.28%
: 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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