A group of friends went to a restaurant. If each pays ₹60, they are short by ₹40. If each pays ₹70, they have ₹30 extra. How many friends are there?
- A.5
- B.6
- C.7 ✓
- D.8
Explanation: Let n be the number of friends. 60n+40 = 70n−30 (both equal the total bill) → 70=10n → n=7.
Class 6 IMO Mathematics Olympiad practice · Olympiad Thinking · Working Backwards & Problem-Solving Strategies
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