Problem-Solving and Data AnalysisEasy–MediumScaling a ratio of ingredients
Problem-Solving and Data Analysis practice question
A recipe uses flour and sugar in the ratio 3 : 2 by mass. How many grams of sugar are needed with 450 grams of flour?
Answer: 300
Sugar = (2/3) × 450 = 300 grams.
Common wrong answers
- If you answered 150
- 150 is one 'part' (450 ÷ 3), not two.
- If you answered 180
- 180 is 2/5 of 450, treating 2 as a share of the total.
- If you answered 675
- 675 comes from (3/2) × 450, inverting the ratio.
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