Problem-Solving and Data AnalysisMediumDensity as a rate
Problem-Solving and Data Analysis practice question
A block of metal has a mass of 240 grams and a volume of 30 cubic centimetres. What is its density, in grams per cubic centimetre?
Answer: 8
Density = mass/volume = 240/30 = 8 grams per cubic centimetre.
Common wrong answers
- If you answered 210
- 210 is 240 − 30; a rate is a quotient, not a difference.
- If you answered 7200
- 7,200 is 240 × 30, multiplying instead of dividing.
- If you answered 0.125
- 0.125 is 30/240, volume per gram — the rate upside down.
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