M

Mr. Dubey • 52.30K Points
Coach Math 

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?

  • (A) 19 years
  • (B) 20 years
  • (C) 21 years
  • (D) 22 years
Correct Answer - Option(C)
Explanation by: Mr. Dubey 
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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