On a shelf, there were 70 skirts and jackets. Jack spilt hot tea on the shelf and stained 50% of the jackets and 25% of the skirts. If 49 skirts and jackets were still clean, how many stained jackets were there?
|
Skirts |
Jackets |
Total |
Stained |
1 u |
1 p |
21 |
Clean |
3 u |
1 p |
49 |
Total |
4 u |
2 p |
70 |
50% =
50100 =
12 25% =
25100 =
14 Number of stained clothes
= 70 - 49
= 21
3 u + 1 p = 49
1 p = 49 - 3 u --- (1)
1 u + 1 p = 21
1 p = 21 - 1 u --- (2)
(2) - (1)
21 - 1 u = 49 - 3 u
3 u - 1 u = 49 - 21
2 u = 28
1 u = 28 ÷ 2 = 14
Number of stained jackets
= 21 - 1 u
= 21 - 14
= 7
Answer(s): 7