in 15 year ’ s time the combined age of my 4 brothers will be 107 . what will it be in the 6 year ’ s time ?
c 71 combined age in 15 years = 107 . 4 × 15 = 60 , therefore combined age now is 107 – 60 = 47 . in 6 years time , therefore , combined age will be 47 + 24 ( 4 x 6 ) = 71 .
add(subtract(107, multiply(15, 4)), multiply(6, 4))