1） 4月有30天,每三天要下雨,然后2天不下雨,问下雨的天数比不下雨的天数多几天...很明显30除以（3+2）=6.小学学过的等式不解释..
2）一个数加上比它本身的2倍小9的数,结果是180,问此数是多少.
即x+(2x-9)=180,x=63
sat数学题 翻译解答(1)in the 30-day month of April,for every 3 days
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