Lucy wanted to buy some wafers and muffins. The cost of a wafer was
34 the cost of a muffin. A set of 7 wafers and 3 muffins cost $6.60. What was the total amount Lucy had to pay for 7 wafers and 10 muffins?
| |
Wafers |
Muffins |
Total |
| Number |
7 |
3 |
|
| Value |
3 u |
4 u |
|
| Total value |
21 u |
12 u |
33 u |
Total cost of wafers and muffins
= 21 u + 12 u
= 33 u
33 u = 6.6
1 u = 6.60 ÷ 33 = 0.2
Cost of 7 wafers and 10 muffins
= 7 x 3 u + 10 x 4 u
= 21 u + 40 u
= 61 u
= 61 x 0.2
= $12.20
Answer(s): $12.20
