Gillian wanted to buy some tarts and wafers. The cost of a tart was
18 the cost of a wafer. A set of 6 tarts and 2 wafers cost $8.80. What was the total amount Gillian had to pay for 9 tarts and 6 wafers?
| |
Tarts |
Wafers |
Total |
| Number |
6 |
2 |
|
| Value |
1 u |
8 u |
|
| Total value |
6 u |
16 u |
22 u |
Total cost of tarts and wafers
= 6 u + 16 u
= 22 u
22 u = 8.8
1 u = 8.80 ÷ 22 = 0.4
Cost of 9 tarts and 6 wafers
= 9 x 1 u + 6 x 8 u
= 9 u + 48 u
= 57 u
= 57 x 0.4
= $22.80
Answer(s): $22.80
