Question

sat数学题 翻译解答

(1)in the 30-day month of April,for every 3 days it rained,there were 2 days it did not rain.the number of days in April on which it rained was how much greater than the number of days on which it did not rain? A:6
(2)a number is added to 9 less than twice the number. if the result is 180,what is the number? A:63

Answer 1

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