1楼读错了.
说四月30天.每下三天雨,就有2天没下雨（也就是说下雨天：不下雨天的比例是3:2）,问下雨的天天数比不下雨的天天数多多少.
所以,30/(3+2) = 6
3*6 = 18天下雨
2*6 = 12天没下雨
18-12=6天
.SAT的数学题In the 30-day month of April,for every three days it
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