The table shows the number of notebooks sold at a bookshop last week.
|
Number of notebooks sold |
Per weekday |
6d |
Saturday |
3d + 40 |
Sunday |
3d - 9 |
- What was the total number of notebooks sold last week? Express your answer in terms of d the simplest form.
- If d = 21, how many notebooks were sold on Sunday?
(a)
Total notebooks sold on weekdays
= 5 x 6
d = 30
d Total notebooks sold on weekends
= 3
d + 40 + 3
d - 9
= 3
d + 3
d + 40 - 9
= 6
d + 31
Total notebooks sold last week
= 30
d + 6
d + 31
= 36
d + 31
(b)
Number of notebooks sold on Sunday
= (3 x 21) - 9
= 63 - 9
= 54
Answer(s): (a) 36
d + 31 or 31 + 36
d ; (b) 54