Discussion

12 year old Manick is three times as old as his brother Rahul. How old will Manick be when he is twice as old as Rahul ?

Answer: B

Manick's present age = 12 years, Rahul's present age = 4 years.

Let Manick be twice as old as Rahul after x years from now.

Then, 12 + x = 2 (4 + x)

\(\Rightarrow 12 + x = 8 + 2x\)

\(\Rightarrow x = 4.\)

Hence, Manick's required age = 12 + x = 16 years

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