Problem: if 28 % of a number exceeds 18 % of it by 7.2 , then find the number ?
Rationale: use the elimination method to find the correct option . of all the options only 90 fits 28 % of 90 = 25.2 18 % of 90 = 16.2 25.2 - 16.2 = 7.2 required number is 90 . answer : e
annotated_formula: add(divide(7.2, divide(subtract(28, 18), const_100)), 18)