Sarah bought 3 puffs more than cookies. Each puff cost $0.60 while each cookie cost $1.90. Given that she spent $24.30 in total, how many cookies did Sarah buy?
| |
Cookies |
Puffs |
Total |
| Number |
1 u |
1 u + 3 |
|
| Value |
$1.90 |
$0.60 |
|
| Total value |
1.9 u |
0.6 u + 1.8 |
0.6 u + 1.8 |
Amount that Sarah paid for the cookies
= 1 u x 1.90
= 1.9 u
Amount that Sarah paid for puffs
= 0.6 x (1 u + 3)
= 0.6 u + 1.8
Total amount that Sarah paid
= 1.9 u + 0.6 u + 1.8
= 2.5 u + 1.8
2.5 u + 1.8 = 24.3
2.5 u = 24.3 - 1.8
2.5 u = 22.5
1 u = 22.5 ÷ 2.5 = 9
Number of cookies that Sarah bought
= 1 u
= 9
Answer(s): 9
