In a bag there are blue sweets, red sweets and green sweets. The ratio of blue sweets to red sweets to green sweets is 3:5:4
Verify that 512\displaystyle \frac{5}{12}125 of the sweets are red.
222 exam-style questions on OCR GCSE Maths Writing a Ratio as a Fraction or Linear Function. Each one has a worked solution and a mark scheme showing where the marks go.