Erika bought 5 biscuits more than cookies. Each biscuit cost $1.60 while each cookie cost $2.30. Given that she spent $23.60 in total, how many cookies did Erika buy?
| |
Cookies |
Biscuits |
Total |
| Number |
1 u |
1 u + 5 |
|
| Value |
$2.30 |
$1.60 |
|
| Total value |
2.3 u |
1.6 u + 8 |
1.6 u + 8 |
Amount that Erika paid for the cookies
= 1 u x 2.30
= 2.3 u
Amount that Erika paid for biscuits
= 1.6 x (1 u + 5)
= 1.6 u + 8
Total amount that Erika paid
= 2.3 u + 1.6 u + 8
= 3.9 u + 8
3.9 u + 8 = 23.6
3.9 u = 23.6 - 8
3.9 u = 15.6
1 u = 15.6 ÷ 3.9 = 4
Number of cookies that Erika bought
= 1 u
= 4
Answer(s): 4
