Use the table given to answer questions (a) and (b).
- What was the total number of tarts sold?
- Express your answer in terms of z in the simplest form. If z = 21, how many more tarts were sold on Sunday than on Saturday?
Day | Number of tarts sold |
Monday to Friday | 3z per day |
Saturday | z + 20 |
Sunday | 4z - 8 |