if 20 % of a number is equal to three - fifth of another number , what is the ratio of first number to the second number ?
"let 20 % of a = 3 / 5 b . then , 20 a / 100 = 3 b / 5 = > 1 a / 5 = 3 b / 5 a / b = ( 3 / 5 * 5 / 1 ) = 3 / 1 a : b = 3 : 1 . answer : a"
divide(divide(const_1, const_4), divide(20, const_100))