A lift goes down 6 floors from the 10th floor, then goes up 9 floors. Which floor is it on now?
- A.7
- B.11
- C.13 ✓
- D.15
Explanation: 10 − 6 + 9 = 13.
Class 6 IMO Mathematics Olympiad practice · Number Sense · Integers — The Other Side of Zero
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