if 40 % of a number exceeds 20 % of it by 12 , then find the number ?
"use the elimination method to find the correct option . of all the options only 60 fits 40 % of 60 = 24 20 % of 60 = 12 24 - 12 = 12 required number is 60 . answer : a"
add(divide(12, divide(subtract(40, 20), const_100)), 20)