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