Q. 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?
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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