A box contains glass marbles, plastic marbles, and metal marbles. The ratio of glass marbles to plastic marbles to metal marbles is 3:1:8 3:1:8\,3:1:8
What fraction of the marbles are glass?
60 exam-style questions on Edexcel 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.