On a shelf, there were 48 sweaters and skirts. Albert spilt orange juice on the shelf and stained 50% of the skirts and 25% of the sweaters. If 33 sweaters and skirts were still clean, how many clean skirts were there?
|
Sweaters |
Skirts |
Total |
Stained |
1 u |
1 p |
15 |
Clean |
3 u |
1 p |
33 |
Total |
4 u |
2 p |
48 |
50% =
50100 =
12 25% =
25100 =
14 Number of stained clothes
= 48 - 33
= 15
3 u + 1 p = 33
1 p = 33 - 3 u --- (1)
1 u + 1 p = 15
1 p = 15 - 1 u --- (2)
(2) - (1)
15 - 1 u = 33 - 3 u
3 u - 1 u = 33 - 15
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
= 15 - 1 u
= 15 - 9
= 6
Answer(s): 6