if 0.10 of a number is equal to 0.070 of another number , the ratio of the numbers is :
"0.10 a = 0.070 b - > a / b = 0.07 / 0.10 = 7 / 10 : . a : b = 7 : 10 answer : c"
divide(multiply(0.070, const_100), multiply(0.10, const_100))