Nicole wanted to buy some cookies and shortbreads. The cost of a cookie was
17 the cost of a shortbread. A set of 7 cookies and 2 shortbreads cost $8.40. What was the total amount Nicole had to pay for 6 cookies and 4 shortbreads?
|
Cookies |
Shortbreads |
Total |
Number |
7 |
2 |
|
Value |
1 u |
7 u |
|
Total value |
7 u |
14 u |
21 u |
Total cost of cookies and shortbreads
= 7 u + 14 u
= 21 u
21 u = 8.4
1 u = 8.40 ÷ 21 = 0.4
Cost of 6 cookies and 4 shortbreads
= 6 x 1 u + 4 x 7 u
= 6 u + 28 u
= 34 u
= 34 x 0.4
= $13.60
Answer(s): $13.60