Currently, the age of a father is three times that of his son. 2.5 years from now, age of the father becomes 2.5 times that of the son. The age of son currently is?

One Answer on this Question

1. Fathers before age=3*before sons age—-(1)
   After 2.5 years..
   Fathers before age+2.5 years =2.5*sons age—-(2)
   Substitute (1) in (2),
   3*sons before age+2.5 years=2.5*sons age
   0.5*sons age=2.5 years
   Sons before age=5years
   So current age after 2.5 years,
   Sons before age+2.5 =5+2.5=7.5 years

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