A library has 240 books in a specific section. All the books are either fiction, non-fiction, biography, or poetry.
25% of the books are fiction.
13\displaystyle \frac{1}{3}31 of the books are non-fiction.
The ratio of the number of biography books to the number of poetry books is 3:7 3:7\,3:7
Work out the number of poetry books in this section.
Practise OCR GCSE Maths Ratio with exam-style questions for Foundation and Higher tier. 93 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers 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.