The table shows the number of pens sold at a bookshop last week.
| |
Number of pens sold |
| Per weekday |
5r |
| Saturday |
2r + 40 |
| Sunday |
3r - 9 |
- What was the total number of pens sold last week? Express your answer in terms of r the simplest form.
- If r = 21, how many pens were sold on Sunday?
(a)
Total pens sold on weekdays
= 5 x 5
r = 25
r Total pens sold on weekends
= 2
r + 40 + 3
r - 9
= 2
r + 3
r + 40 - 9
= 5
r + 31
Total pens sold last week
= 25
r + 5
r + 31
= 30
r + 31
(b)
Number of pens sold on Sunday
= (3 x 21) - 9
= 63 - 9
= 54
Answer(s): (a) 30
r + 31 or 31 + 30
r ; (b) 54
