1樓讀錯了.
說四月30天.每下三天雨,就有2天沒下雨（也就是說下雨天：不下雨天的比例是3:2）,問下雨的天天數(shù)比不下雨的天天數(shù)多多少.
所以,30/(3+2) = 6
3*6 = 18天下雨
2*6 = 12天沒下雨
18-12=6天
.SAT的數(shù)學題
.SAT的數(shù)學題
In the 30-day month of April,for every three days it rained ,there were two days it did not rain.The number if days in April on which ie rained was how much great than the number of days on which it did not rain?
In the 30-day month of April,for every three days it rained ,there were two days it did not rain.The number if days in April on which ie rained was how much great than the number of days on which it did not rain?
英語人氣：108 ℃時間：2020-05-20 00:09:21
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