Roshel wanted to buy some croissants and tarts. The cost of a croissant was
35 the cost of a tart. A set of 5 croissants and 2 tarts cost $7.50. What was the total amount Roshel had to pay for 3 croissants and 7 tarts?
| |
Croissants |
Tarts |
Total |
| Number |
5 |
2 |
|
| Value |
3 u |
5 u |
|
| Total value |
15 u |
10 u |
25 u |
Total cost of croissants and tarts
= 15 u + 10 u
= 25 u
25 u = 7.5
1 u = 7.50 ÷ 25 = 0.3
Cost of 3 croissants and 7 tarts
= 3 x 3 u + 7 x 5 u
= 9 u + 35 u
= 44 u
= 44 x 0.3
= $13.20
Answer(s): $13.20
