AlgebraEasy–MediumFewest whole units to reach a target
Algebra practice question
A water tank must hold at least 45 litres for a camping trip. Water is sold in 6-litre containers. What is the fewest number of containers needed?
Answer: 8
6n ≥ 45 gives n ≥ 7.5. The fewest whole containers is 8.
Common wrong answers
- If you answered 7
- 7 containers hold only 42 litres, less than 45.
- If you answered 9
- 9 is more than needed; 8 already gives 48 litres.
- If you answered 7.5
- 7.5 is the exact quotient, but containers are whole.
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