Gwen wanted to buy some croissants and shortbreads. The cost of a croissant was
18 the cost of a shortbread. A set of 5 croissants and 2 shortbreads cost $6.30. What was the total amount Gwen had to pay for 4 croissants and 4 shortbreads?
| |
Croissants |
Shortbreads |
Total |
| Number |
5 |
2 |
|
| Value |
1 u |
8 u |
|
| Total value |
5 u |
16 u |
21 u |
Total cost of croissants and shortbreads
= 5 u + 16 u
= 21 u
21 u = 6.3
1 u = 6.30 ÷ 21 = 0.3
Cost of 4 croissants and 4 shortbreads
= 4 x 1 u + 4 x 8 u
= 4 u + 32 u
= 36 u
= 36 x 0.3
= $10.80
Answer(s): $10.80
