NCHMCT JEE 2015 Question Paper with solutions for online practice

Let, Arun’s age = x years
Raj’s age = 3x years
Kamal’s age = (3x + 5) years
According to the question,
(x) + (3x) + (3x + 5) = 40
⇒ 7x = 35 ⇒ x = 5
⇒ Raj’s age = 3x = 3 × 5 = 15 years