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 son's age be s. Father is s + 30. After 5 years: s + 5 + 30 = 3(s + 5). So s + 35 = 3s + 15, giving 20 = 2s, thus s = 10. Father is 40 years old now. Check: after 5 years, son is 15, father is 45, and 45 = 3 × 15.

AI explanation

Let the son's current age be S, so the father's current age is S+30. In 5 years, the father's age (S+35) will be three times the son's age (S+5): S+35 = 3(S+5), which solves to S=10. That makes the father's present age 10+30 = 40 years.

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