RRB NTPC Prelims Model Paper 2 with solutions

(1) Let the present age of Amit and Naman be 5x and 6x years,respectively.
According to the question,
6x + 4 = 28
⇒ 6x = 24
⇒ x = 4 Therefore, Amit’s present age
= 5x = 5 × 4 = 20 years