Joelle bought 9 croissants more than cookies. Each croissant cost $0.40 while each cookie cost $1.60. Given that she spent $25.20 less on the croissants than on the cookies, how many croissants did Joelle buy?
| |
Cookies |
Croissants |
Difference |
| Number |
1 u |
1 u + 9 |
|
| Value |
1.60 |
0.40 |
|
| Total value |
1.6 u |
0.4 u + 3.6 |
1.2 u - 3.6 |
Amount that Joelle paid for the cookies
= 1 u x 1.6
= 1.6 u
Amount that Joelle paid for the croissants
= 0.4 x (1 u + 9)
= 0.4 u + 3.6
Amount that Joelle paid less on the croissants than the cookies
= 1.6 u - (0.4 u + 3.6)
= 1.6 u - 0.4 u - 3.6
= 1.2 u - 3.6
1.2 u - 3.6 = 25.20
1.2 u = 25.20 + 3.6
1.2 u = 28.8
1 u = 28.8 ÷ 1.2 = 24
Number of croissants that Joelle bought
= 1 u + 9
= 24 + 9
= 33
Answer(s): 33
