Three boxes contain apples. Box B has 5 more apples than Box A. Box C has twice as many apples as Box B. If the total is 63, how many apples are in Box A?
- A.10
- B.11
- C.12 ✓
- D.13
Explanation: Let Box A = a. Box B = a+5, Box C = 2(a+5). Total: a+(a+5)+2(a+5)=4a+15=63 → 4a=48 → a=12.
Class 6 IMO Mathematics Olympiad practice · Olympiad Thinking · Working Backwards & Problem-Solving Strategies
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