What will be the Son’s Present Age in Years?

Present ages of father & son are in the ratio of 5:1 respectively. Seven years later this ratio becomes 3:1. What is the son’s present age in years?

  1. 8
  2. 7
  3. 6
  4. 5
Monis Rasool Professor Asked on 16th June 2015 in Maths.
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1 Answer(s)

Answer: (2) 7
Explanation:-
Let be the age of the father = 5X         and    age of boy  = X
According to the question,
(5X + 7) /(X + 7 ) = 3/1
By cross multiplication-
5X + 7 = 3X + 21
5X – 3X  = 21 – 7
2X = 14
X = 14/2
X = 7
Thus, the present age of the son is 7 years.
Hence, the answer is (2) 7.

Anurag Mishra Professor Answered on 17th June 2015.
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