The table shows the number of files sold at a bookshop last week.
|
Number of files sold |
Per weekday |
5c |
Saturday |
3c + 40 |
Sunday |
3c - 9 |
- What was the total number of files sold last week? Express your answer in terms of c the simplest form.
- If c = 21, how many files were sold on Sunday?
(a)
Total files sold on weekdays
= 5 x 5
c = 25
c Total files sold on weekends
= 3
c + 40 + 3
c - 9
= 3
c + 3
c + 40 - 9
= 6
c + 31
Total files sold last week
= 25
c + 6
c + 31
= 31
c + 31
(b)
Number of files sold on Sunday
= (3 x 21) - 9
= 63 - 9
= 54
Answer(s): (a) 31
c + 31 or 31 + 31
c ; (b) 54