1.

I am three times as old as my son. After 10 years hence, I will be twice as old as my son. The sum of our ages is1). 40 years2). 60 years3). 84 years4). 72 years

Answer»

⇒ Let the age of son be x

⇒ then age of FATHER = 3X

⇒ after 10 years father will be twice as old as son

⇒ Father age = 3x + 10

⇒ Son age = x + 10

⇒ 3x + 10 = 2(x + 10)

⇒ 3x + 10 = 2X + 20

⇒ x = 10

SUM of their ages = x + 3x

⇒ Sum of their ages = 10 + 30

∴ Sum of their ages = 40


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