Problem-Solving and Data AnalysisEasy–MediumPercent remaining after a percent used
Problem-Solving and Data Analysis practice question
A gardener had 45 litres of fertiliser and used 40% of it in spring. How many litres remained?
Answer: 27
40% of 45 is 18, so 45 − 18 = 27 litres remain. (Or 60% of 45 = 27.)
Common wrong answers
- If you answered 5
- 5 subtracts 40 from 45, mixing a percentage with litres.
- If you answered 18
- 18 is the amount USED.
- If you answered 63
- 63 adds 40% instead of removing it.
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