ages of two persons differ by 18 years . if 4 years ago , the elder one was 4 times as old the younger one , find their present age
explanation : let the age of younger person be x , then elder person ' s age is ( x + 18 ) = > 4 ( x - 4 ) = ( x + 18 - 4 ) [ 4 years before ] = > 4 x - 16 = x + 14 = > x = 10 . so elder person ' s age is x + 18 = 28 answer : option c
subtract(divide(subtract(add(multiply(4, 4), 18), 4), subtract(4, const_1)), const_1)