Here is a list of six numbers. One of the numbers is hidden.
| 18 | 22 | 19 | 21 | 25 | ? |
| ---- | --- | --- | --- | --- | --- |
The mean of the numbers is 20.
Find the value of the hidden number.
201 exam-style questions on Eduqas GCSE Maths Averages. Each one has a worked solution and a mark scheme showing where the marks go.