Names | Number of cardboard |
Ellie | 4 |
Matthew | z |
William | 5 + 9 z |
The table shows the number of cardboard collected by 3 children.
- Find the total number of cardboard Ellie, Matthew and William collected. Express the answer in terms of z in the simplest form.
- If z = 6, find the average number of cardboard the 3 children collected.