Problem-Solving and Data AnalysisEasy–MediumPart from a ratio and a total
Problem-Solving and Data Analysis practice question
A paint mixture uses blue and white in the ratio 5 to 3. How many millilitres of blue are needed to make 120 millilitres of the mixture?
Answer: 75
The ratio has 5 + 3 = 8 parts, and 120 ÷ 8 = 15 mL per part. Blue: 5 × 15 = 75.
Common wrong answers
- If you answered 24
- 24 divides 120 by 5, using the wrong number of parts.
- If you answered 45
- 45 is the WHITE amount (3 parts).
- If you answered 200
- 200 multiplies 120 by 5/3, treating the ratio as blue-to-total.
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