A skirt cost $10 more than a cardigan. Anna paid $310 for 3 skirts and 4 cardigans. How much did 1 skirt cost?
| |
Cardigans |
Skirts |
Total |
| Number |
4 |
3 |
|
| Value |
1 u |
1 u + 10 |
|
| Total value |
4 u |
3 u + 30 |
7 u + 30 |
Cost of 1 cardigan = 1 u
Cost of 4 cardigans = 4 u
Cost of 1 skirt = 1 u + 10
Cost of 3 skirts
= 3 x (1 u + 10)
= 3 u + 30
Cost of 4 cardigans and 3 skirts
= 4 u + 3 u + 30
= 7 u + 30
7 u + 30 = 310
7 u = 310 - 30
7 u = 280
1 u = 280 ÷ 7 = 40
Cost of 1 skirt
= 40 + 10
= $50
Answer(s): $50
