if 2.5 of a number is equal to 0.75 of another number , the ratio of the numbers is :
"2.5 a = 0.75 b - > a / b = 0.75 / 2.5 = 75 / 250 = 3 / 10 : . a : b = 3 : 10 answer : c"
divide(multiply(0.75, const_100), multiply(2.5, const_100))