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Arithmetic Reasoning - Verbal and Reasoning

Q1:

A father is now three times as old as his son. Five years back, he was four times as old as his son. The age of the son (in years) is

A 12

B 15

C 18

D 20

ANS:B - 15

Let son's age be x years. Then, father's age = (3x) years.Five years ago, father's age = (3x - 5) years and son's age = (x - 5) years.So, 3x - 5 = 4 (x - 5) 3x - 5 = 4x - 20 x = 15.