Question

A rational number is such that when it is multiplied by 2/5 and add 2/3 to the product we get 15 . Find the rational number?

Answer 1

(x*2/5) +2/3 =15 : x*2/3=15 - 2/3 : 2x/5=43/3 : 43/3*5/2=x : 215/6=x