The number of students studying subjects A, B and C in a school are in the proportion 12 : 15 : 16. There is a proposal to increase the number of students studying A, B and C, respectively by 50%, 20% and 50%. What will be the new proportion of the number of students studying A, B and C?

3 : 3 : 5 3 : 3 : 4 2 : 3 : 3 5 : 8 : 12

3 : 3 : 4

A : B : C = 12 : 15 : 16 ⇒ 12 x 150% : 15 x 120% : 16 x 150% ⇒ 18 : 18 : 24  = 3 : 3 : 4.