Kylie bought 3 shortbreads more than tarts. Each shortbread cost $1.10 while each tart cost $2.10. Given that she spent $25.70 in total, how many tarts did Kylie buy?
| |
Tarts |
Shortbreads |
Total |
| Number |
1 u |
1 u + 3 |
|
| Value |
$2.10 |
$1.10 |
|
| Total value |
2.1 u |
1.1 u + 3.3 |
1.1 u + 3.3 |
Amount that Kylie paid for the tarts
= 1 u x 2.10
= 2.1 u
Amount that Kylie paid for shortbreads
= 1.1 x (1 u + 3)
= 1.1 u + 3.3
Total amount that Kylie paid
= 2.1 u + 1.1 u + 3.3
= 3.2 u + 3.3
3.2 u + 3.3 = 25.7
3.2 u = 25.7 - 3.3
3.2 u = 22.4
1 u = 22.4 ÷ 3.2 = 7
Number of tarts that Kylie bought
= 1 u
= 7
Answer(s): 7
