A man is now 4 times as old as his son. In 5 years, he will be 3 times as old as his son. Find the son's current age.
- A.8
- B.9
- C.10 ✓
- D.12
Explanation: Let the son's age be s. 4s+5 = 3(s+5) → 4s+5=3s+15 → s=10.
Class 6 IMO Mathematics Olympiad practice · Olympiad Thinking · Working Backwards & Problem-Solving Strategies
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