Use the table given to answer questions (a) and (b).
- What was the total number of shortbreads sold?
- Express your answer in terms of d in the simplest form. If d = 18, how many less shortbreads were sold on Saturday than on Sunday?
Day | Number of shortbreads sold |
Monday to Friday | 5d per day |
Saturday | d + 39 |
Sunday | 4d - 5 |