A number is doubled, then 6 is subtracted, giving 20. What was the original number?
- A.10
- B.12
- C.13 ✓
- D.14
Explanation: Reverse the steps: 20 + 6 = 26, then 26 ÷ 2 = 13.
Class 6 IMO Mathematics Olympiad practice · Olympiad Thinking · Working Backwards & Problem-Solving Strategies
← All Working Backwards & Problem-Solving Strategies questions