Names | Number of cardboard |
Isabella | 3 |
Lily | s |
Ella | 9 + 4 s |
The table shows the number of cardboard collected by 3 students.
- Find the total number of cardboard Isabella, Lily and Ella collected. Express the answer in terms of s in the simplest form.
- If s = 3, find the average number of cardboard the 3 students collected.