On a shelf, there were 74 cardigans and skirts. Andy spilt juice on the shelf and stained 50% of the skirts and 25% of the cardigans. If 46 cardigans and skirts were still clean, how many clean skirts were there?
| |
Cardigans |
Skirts |
Total |
| Stained |
1 u |
1 p |
28 |
| Clean |
3 u |
1 p |
46 |
| Total |
4 u |
2 p |
74 |
50% =
50100 =
12 25% =
25100 =
14 Number of stained clothes
= 74 - 46
= 28
3 u + 1 p = 46
1 p = 46 - 3 u --- (1)
1 u + 1 p = 28
1 p = 28 - 1 u --- (2)
(2) - (1)
28 - 1 u = 46 - 3 u
3 u - 1 u = 46 - 28
2 u = 18
1 u = 18 ÷ 2 = 9
Number of clean skirts is the same as the number of stained skirts.
Number of clean skirts
= 28 - 1 u
= 28 - 9
= 19
Answer(s): 19
