Problem-Solving and Data AnalysisMediumCement in a concrete mix
Problem-Solving and Data Analysis practice question
Concrete mix is made from cement and sand in the ratio 1 : 4 by mass. A builder needs 60 kilograms of the mix. How many kilograms of cement are needed?
Answer: 12
Cement is 1 part in 5, so 60 × 1/5 = 12.
Common wrong answers
- If you answered 15
- 15 divides 60 by 4, using the sand's share as the total.
- If you answered 20
- 20 divides 60 by 3.
- If you answered 48
- 48 is the mass of sand.
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