A rock has a mass of 56 grams and a density of 3.5 grams/cm33.5 \text{ grams/cm}^33.5 grams/cm3.
Work out the volume of the rock.
Hence, work out the density of the rock if its mass were 72 grams.
203 exam-style questions on OCR GCSE Maths Speed and Density. Each one has a worked solution and a mark scheme showing where the marks go.