On a shelf, there were 63 skirts and jackets. Zane spilt hot juice on the shelf and stained 50% of the jackets and 20% of the skirts. If 42 skirts and jackets were still clean, how many stained jackets were there?
| |
Skirts |
Jackets |
Total |
| Stained |
1 u |
1 p |
21 |
| Clean |
4 u |
1 p |
42 |
| Total |
5 u |
2 p |
63 |
50% =
50100 =
12 20% =
20100 =
15 Number of stained clothes
= 63 - 42
= 21
4 u + 1 p = 42
1 p = 42 - 4 u --- (1)
1 u + 1 p = 21
1 p = 21 - 1 u --- (2)
(2) - (1)
21 - 1 u = 42 - 4 u
4 u - 1 u = 42 - 21
3 u = 21
1 u = 21 ÷ 3 = 7
Number of stained jackets
= 21 - 1 u
= 21 - 7
= 14
Answer(s): 14
