find the compound ratio of ( 3 : 4 ) , ( 4 : 5 ) and ( 1 : 2 ) is
"required ratio = 3 / 4 * 4 / 5 * 1 / 2 = 3 / 10 = 3 : 10 answer is c"
multiply(divide(3, const_3.0), multiply(divide(3, 4), divide(4, 4)))