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2014-10-26T23:29:47+05:30

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Let the father's present age = x
              son's present age = y
as father is 4 times as old as his son,
   x = 4y   ---------------(1)

after 5 years,
 son's age = y+5
 father's age = x+ 5 

after 5 years, father's age will be thrice son's age.
x+5 = 3×(y+5)
⇒ 4y + 5 = 3y + 15
⇒ 4y - 3y = 15 - 5
⇒ y = 10 (son's present age)
   x = 4y = 10×4 = 40 (father's present age)
2 5 2
any problem in understanding, safia?
Thank you:)
:)i understood it thanks a lot:)
:-)