# Know the age puzzle

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Tony’s father is 45. He is 15 years older than twice Tony’s age. How old is Tony? John is twice as old as Jacob. Three years from now, the sum of their ages will be 42.

How old is John?

SherlockHolmes Expert Asked on 23rd January 2018 in

Tony is 15, John is 24, Jacob, 12

Explanation:

1. Let Tony’s age be X. Since his father who is 45, is 15 yrs older than twice his age, 2X + 15 = 45 => X = 15.

2. Let Jacob’s age be Y, and John be Z.
Since John is twice as old as Jacob, Z = 2Y.
3 years from now, their ages will be Y + 3 and Z + 3. But since Z = 2Y, this implies that the ages will be Y + 3 and 2Y + 3.
The sum of the ages = Y + 3 + 2Y + 3 = 3Y + 6 = 42. Hence Y = 12; Z = 24.

Viji_Pinarayi Expert Answered on 23rd January 2018.

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