Today is Ketan's birthday. One year from today he will be twice as old as he was 10 years ago. How old is Ketan today?

19 years
20 years
21 years
22 years

Correct Answer: 21 years

Explanation:

Suppose the present age of Ketan is P years.
According to question,
present age of Ketan + 1 year = 2 ( present age of Ketan - 10 years )
P + 1 = 2 (P – 10)
⇒ P + 1 = 2P – 20
⇒ 2P – P = 20 + 1
∴ P = 21 years
Therefore ,present age of Ketan is 21 years .

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