A box contains black pens and blue pens. The ratio of the number of black pens to the number of blue pens is 5:2.
What fraction of the pens in the box are black?
Practise AQA GCSE Maths Writing a Ratio as a Fraction or Linear Function with exam-style questions for Foundation and Higher tier. 60 questions, matched to the AQA GCSE Maths (8300) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.