Names | Number of glass bottles |
William | 4 |
Ella | z |
Ryan | 5 + 4 z |
The table shows the number of glass bottles collected by 3 pupils.
- Find the total number of glass bottles William, Ella and Ryan collected. Express the answer in terms of z in the simplest form.
- If z = 6, find the average number of glass bottles the 3 pupils collected.