Robin’s age after 15 years will be 5 times his age 5 years back. What is the present age of Robin?

5 years

10 years

12 years

15 years

Let Robin’s present age be x years. Then, Robin’s age after 15 years = (x + 15) years. Robin’s age 5 years back = (x - 5) years. => x + 15 = 5 (x - 5) ? x + 15 = 5x - 25 => 4x = 40 ? x = 10. Hence, Robin present age = 10 years.

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