On a shelf, there were 57 shirts and jackets. Asher spilt tea on the shelf and stained 50% of the jackets and 20% of the shirts. If 36 shirts and jackets were still clean, how many clean jackets were there?
| |
Shirts |
Jackets |
Total |
| Stained |
1 u |
1 p |
21 |
| Clean |
4 u |
1 p |
36 |
| Total |
5 u |
2 p |
57 |
50% =
50100 =
12 20% =
20100 =
15 Number of stained clothes
= 57 - 36
= 21
4 u + 1 p = 36
1 p = 36 - 4 u --- (1)
1 u + 1 p = 21
1 p = 21 - 1 u --- (2)
(2) - (1)
21 - 1 u = 36 - 4 u
4 u - 1 u = 36 - 21
3 u = 15
1 u = 15 ÷ 3 = 5
Number of clean jackets is the same as the number of stained jackets.
Number of clean jackets
= 21 - 1 u
= 21 - 5
= 16
Answer(s): 16
