Sarah wanted to buy some wafers and macarons. The cost of a wafer was
35 the cost of a macaron. A set of 6 wafers and 2 macarons cost $11.20. What was the total amount Sarah had to pay for 7 wafers and 3 macarons?
| |
Wafers |
Macarons |
Total |
| Number |
6 |
2 |
|
| Value |
3 u |
5 u |
|
| Total value |
18 u |
10 u |
28 u |
Total cost of wafers and macarons
= 18 u + 10 u
= 28 u
28 u = 11.2
1 u = 11.20 ÷ 28 = 0.4
Cost of 7 wafers and 3 macarons
= 7 x 3 u + 3 x 5 u
= 21 u + 15 u
= 36 u
= 36 x 0.4
= $14.40
Answer(s): $14.40
