Problem-Solving and Data AnalysisEasy–MediumBalls of wool for a longer scarf
Problem-Solving and Data Analysis practice question
A knitting pattern uses 3 balls of wool for a scarf 120 centimetres long. At the same rate, how many balls of wool are needed for a scarf 200 centimetres long?
Answer: 5
3/120 = 1/40 ball per centimetre, so 200 cm needs 200/40 = 5 balls.
Common wrong answers
- If you answered 4
- 4 rounds the answer down for no reason.
- If you answered 6
- 6 doubles 3 as though 200 were twice 120.
- If you answered 80
- 80 is the extra length in centimetres.
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