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