Multiple choice general knowledge math & puzzles

A father is 30 years older than his son, however he will be only thrice as old as the son after 5 years, what is the father's present age ?

  1. 40 yrs

  2. 30 yrs

  3. 50 yrs

  4. None of the above
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A Correct answer
Explanation

Let the son's current age be x years. Then the father's age is x + 30 years. After 5 years: son's age = x + 5, father's age = x + 35. Given that father will be thrice as old as son: x + 35 = 3(x + 5). Solving: x + 35 = 3x + 15, so 2x = 20, x = 10. Father's present age = 10 + 30 = 40 years.

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