RRB NTPC Prelims Model Paper 1 with solutions

Question : 91 of 100

Marks: +1, -0

Before 15 years, a man’s age is thrice of his son. At present, the age of man is twice that of his son, then find the age of son.

Solution:

(1) 15 years ago,Son’s age = x years
Father’s age = 3x years
At present,

3x + 15 = 2 (x + 15)

⇒ 3x + 15 = 2x + 30

⇒3x – 2x = 30 – 15

⇒ x = 15

∴Son’s present age = 15 + 15= 30 years

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