In a theatre the ratio of adults to children is 7:3 The children are all either boys or girls. The ratio of boys to girls is 3:2
Verify that the percentage of all the people in the theatre who are girls is 12%.
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.