There are 80 books on a shelf.
38\displaystyle \frac{3}{8}83 of the books are fiction books.
25\displaystyle \frac{2}{5}52 of the books are non-fiction books.
The rest of the books are reference books.
Work out how many reference books are on the shelf.
87 exam-style questions on WJEC GCSE Maths Fractions of an Amount. Each one has a worked solution and a mark scheme showing where the marks go.