Write the ratio 45:20 45 : 20\,45:20 in its simplest form
17\displaystyle \frac{1}{7}71 of the counters in a bag are blue.
Write the ratio of blue counters to counters that are not blue.
64 exam-style questions on Edexcel GCSE Maths Writing and Simplifying Ratio. Each one has a worked solution and a mark scheme showing where the marks go.