[36 years, 9 years] The sum of the ages of a father and son is 45 years. Five years ago the product of their ages was 4

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The sum of the ages of a father and son is 45 years. Five years ago the product of their ages was 4 times the fathers age at that time. The present ages of the father and son, respectively are,

25 years, 10 years

36 years, 9 years

39 years, 5 years

none of these

Explanation:

Let the present ages of father and son be x years and (45-x) years
Then, (x-5)(45-x-5)=4(x-5)
45-x-5=4 or x = 36
The present ages of father and son are 36 years and 9 years respectively.

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