I think of a number, add 8, then multiply by 3. The result is 45. What is my number?
- A.5
- B.6
- C.7 ✓
- D.9
Explanation: Reverse the operations: 45 ÷ 3 = 15, then 15 − 8 = 7.
Class 6 IMO Mathematics Olympiad practice · Olympiad Thinking · Working Backwards & Problem-Solving Strategies
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