Gwen wanted to buy some cookies and cupcakes. The cost of a cookie was
35 the cost of a cupcake. A set of 6 cookies and 3 cupcakes cost $13.20. What was the total amount Gwen had to pay for 7 cookies and 4 cupcakes?
| |
Cookies |
Cupcakes |
Total |
| Number |
6 |
3 |
|
| Value |
3 u |
5 u |
|
| Total value |
18 u |
15 u |
33 u |
Total cost of cookies and cupcakes
= 18 u + 15 u
= 33 u
33 u = 13.2
1 u = 13.20 ÷ 33 = 0.4
Cost of 7 cookies and 4 cupcakes
= 7 x 3 u + 4 x 5 u
= 21 u + 20 u
= 41 u
= 41 x 0.4
= $16.40
Answer(s): $16.40
