If x : y = 3 : 2 and x + y = 90, then the value (x - y) is :

12 18 16 14

18

Here, x : y 3 : 2 x+ y = 90, ⇒ (3 + 2) units = 90 ⇒ 5 units = 90 ⇒ 1 unit = 18 ⇒ (3 - 2) = 1 x 18 = 18.