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2016-02-05T17:15:22+05:30
Let the age of Father be x
Age of Boy = 1/3 rd of x = x/3
After 12 years father`s age = x+12
Boy`s age = x/3  + 12
But given that  boy`s age will be half of father`s age = (x+12)/2
⇒ x/3  +12 = (x+12)/2
⇒ (x+36)/3 = (x+12)/2
⇒ 2(x+36) = 3(x+12)
⇒ 2x + 72 = 3x + 36
⇒ 72 -36 = 3x - 2x
⇒ 36 = x
∴ x = 36
∴ Father`s age  = x = 36Yrs
   Boy`s age = x/3 = 36/3 = 12Yrs
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