Names | Number of cardboard |
Jamie | 3 |
Aria | d |
Jack | 9 + 9 d |
The table shows the number of cardboard collected by 3 children.
- Find the total number of cardboard Jamie, Aria and Jack collected. Express the answer in terms of d in the simplest form.
- If d = 9, find the average number of cardboard the 3 children collected.