Jade bought 7 shortbreads more than cookies. Each shortbread cost $1.80 while each cookie cost $1.90. Given that she spent $23.70 in total, how many cookies did Jade buy?
| |
Cookies |
Shortbreads |
Total |
| Number |
1 u |
1 u + 7 |
|
| Value |
$1.90 |
$1.80 |
|
| Total value |
1.9 u |
1.8 u + 12.6 |
1.8 u + 12.6 |
Amount that Jade paid for the cookies
= 1 u x 1.90
= 1.9 u
Amount that Jade paid for shortbreads
= 1.8 x (1 u + 7)
= 1.8 u + 12.6
Total amount that Jade paid
= 1.9 u + 1.8 u + 12.6
= 3.7 u + 12.6
3.7 u + 12.6 = 23.7
3.7 u = 23.7 - 12.6
3.7 u = 11.1
1 u = 11.1 ÷ 3.7 = 3
Number of cookies that Jade bought
= 1 u
= 3
Answer(s): 3
