On a shelf, there were 34 sweaters and jackets. Fred spilt hot milk on the shelf and stained 50% of the jackets and 25% of the sweaters. If 20 sweaters and jackets were still clean, how many stained jackets were there?
|
Sweaters |
Jackets |
Total |
Stained |
1 u |
1 p |
14 |
Clean |
3 u |
1 p |
20 |
Total |
4 u |
2 p |
34 |
50% =
50100 =
12 25% =
25100 =
14 Number of stained clothes
= 34 - 20
= 14
3 u + 1 p = 20
1 p = 20 - 3 u --- (1)
1 u + 1 p = 14
1 p = 14 - 1 u --- (2)
(2) - (1)
14 - 1 u = 20 - 3 u
3 u - 1 u = 20 - 14
2 u = 6
1 u = 6 ÷ 2 = 3
Number of stained jackets
= 14 - 1 u
= 14 - 3
= 11
Answer(s): 11