.SAT的数学题

题目

.SAT的数学题
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?

答案

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