Jaslyn wanted to buy some croissants and cupcakes. The cost of a croissant was
17 the cost of a cupcake. A set of 7 croissants and 2 cupcakes cost $8.40. What was the total amount Jaslyn had to pay for 4 croissants and 5 cupcakes?
| |
Croissants |
Cupcakes |
Total |
| Number |
7 |
2 |
|
| Value |
1 u |
7 u |
|
| Total value |
7 u |
14 u |
21 u |
Total cost of croissants and cupcakes
= 7 u + 14 u
= 21 u
21 u = 8.4
1 u = 8.40 ÷ 21 = 0.4
Cost of 4 croissants and 5 cupcakes
= 4 x 1 u + 5 x 7 u
= 4 u + 35 u
= 39 u
= 39 x 0.4
= $15.60
Answer(s): $15.60
