Using working backwards: a number is divided by 4, then 7 is added, giving 15. What was the original number?
- A.28
- B.30
- C.32 ✓
- D.34
Explanation: Reverse the steps: 15−7=8, then 8×4=32.
Class 6 IMO Mathematics Olympiad practice · Olympiad Thinking · Working Backwards & Problem-Solving Strategies
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