Write the ratio 35:15 35 : 15\,35:15 in its simplest form.
There are red shapes and blue shapes in a box, 13\displaystyle \frac{1}{3}31 of the shapes are red.
Write the ratio of red shapes to blue shapes.
249 exam-style questions on OCR GCSE Maths Writing and Simplifying Ratio. Each one has a worked solution and a mark scheme showing where the marks go.