Use the table given to answer questions (a) and (b).
- What was the total number of tarts sold?
- Express your answer in terms of r in the simplest form. If r = 16, how many less tarts were sold on Saturday than on Sunday?
Day | Number of tarts sold |
Monday to Friday | 5r per day |
Saturday | r + 30 |
Sunday | 4r - 7 |