Question

一个数的四分之七比这个数的百分之二十多二分之一.这个数是多少

Answer 1

(1/2) / (7/4 - 20%)

= (1/2) / (7/4 - 1/5)

= (1/2) / (31/20)

= (1/2) * (20/31)

= 10/31

可能是 四分之一 吧.

(1/2) / (1/4 - 20%)

= (1/2) / (1/4 - 1/5)

= (1/2) / (1/20)

= (1/2) * 20

= 10