Reena spends half her pocket money on books, then ₹20 on a pen, and is left with ₹30. How much pocket money did she start with?
- A.80
- B.90
- C.100 ✓
- D.110
Explanation: Before the pen: 30+20=₹50, which was half her money, so she started with 50×2=₹100.
Class 6 IMO Mathematics Olympiad practice · Olympiad Thinking · Working Backwards & Problem-Solving Strategies
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