Problem of Ages

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?
A. 22 years
B. 18 years
C. 15 years
D. 20 years

Questions by Arayna

Showing Answers 1 - 7 of 7 Answers


  • Nov 4th, 2015

None of these is correct (unless the question is misleading). Based on father being 3 times age of his son today and 2.5 times in 2.5 years, the correct answer is that the son is 7.5 years which is not presented as an option

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amos munyua

  • Nov 12th, 2015


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  • Nov 13th, 2015

Let father age is f and son age is s
According to the question, f=3*s and after 2.5 years f+2.5=2.5*(s+2.5)
=> f+2.5=2.5s+6.25
=> 3*s+2.5=2.5s+6.25, because f=3*s
=> 0.5s=3.75
=> s=7.5
so, current age of son will be 7.5 years

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  • Jan 23rd, 2016

Lets take x as father

y as son

present age of father x=3y

after 2.5 years father x+2.5=(y+2.5)*2.5

so 3y+2.5=2.5y+2.5*2.5
then 0.5y=7.5
y=15 years

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  • Feb 11th, 2016

Option C

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  • May 18th, 2016

Let, at present sons age = x
so, fathers age = 3x

and after 2.5 years sons age will be = (x+2.5) yrs
so,fathers age will be = (3x+2.5) yrs

so, according to the problem,

or, x=3.75/0.5
or, x=7.5
so, now fathers age will be 22.5 yrs

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