Joelle wanted to buy some wafers and puffs. The cost of a wafer was
17 the cost of a puff. A set of 7 wafers and 3 puffs cost $11.20. What was the total amount Joelle had to pay for 3 wafers and 8 puffs?
| |
Wafers |
Puffs |
Total |
| Number |
7 |
3 |
|
| Value |
1 u |
7 u |
|
| Total value |
7 u |
21 u |
28 u |
Total cost of wafers and puffs
= 7 u + 21 u
= 28 u
28 u = 11.2
1 u = 11.20 ÷ 28 = 0.4
Cost of 3 wafers and 8 puffs
= 3 x 1 u + 8 x 7 u
= 3 u + 56 u
= 59 u
= 59 x 0.4
= $23.60
Answer(s): $23.60
