Elyse bought 8 cookies more than puffs. Each cookie cost $0.70 while each puff cost $2.10. Given that she spent $25.20 in total, how many puffs did Elyse buy?
| |
Puffs |
Cookies |
Total |
| Number |
1 u |
1 u + 8 |
|
| Value |
$2.10 |
$0.70 |
|
| Total value |
2.1 u |
0.7 u + 5.6 |
0.7 u + 5.6 |
Amount that Elyse paid for the puffs
= 1 u x 2.10
= 2.1 u
Amount that Elyse paid for cookies
= 0.7 x (1 u + 8)
= 0.7 u + 5.6
Total amount that Elyse paid
= 2.1 u + 0.7 u + 5.6
= 2.8 u + 5.6
2.8 u + 5.6 = 25.2
2.8 u = 25.2 - 5.6
2.8 u = 19.6
1 u = 19.6 ÷ 2.8 = 7
Number of puffs that Elyse bought
= 1 u
= 7
Answer(s): 7
