Names | Number of glass bottles |
Samuel | 9 |
Lily | z |
Risa | 9 + 8 z |
The table shows the number of glass bottles collected by 3 children.
- Find the total number of glass bottles Samuel, Lily and Risa collected. Express the answer in terms of z in the simplest form.
- If z = 9, find the average number of glass bottles the 3 children collected.