On a shelf, there were 62 jackets and sweaters. Justin spilt hot milk on the shelf and stained 50% of the sweaters and 20% of the jackets. If 43 jackets and sweaters were still clean, how many stained sweaters were there?
| |
Jackets |
Sweaters |
Total |
| Stained |
1 u |
1 p |
19 |
| Clean |
4 u |
1 p |
43 |
| Total |
5 u |
2 p |
62 |
50% =
50100 =
12 20% =
20100 =
15 Number of stained clothes
= 62 - 43
= 19
4 u + 1 p = 43
1 p = 43 - 4 u --- (1)
1 u + 1 p = 19
1 p = 19 - 1 u --- (2)
(2) - (1)
19 - 1 u = 43 - 4 u
4 u - 1 u = 43 - 19
3 u = 24
1 u = 24 ÷ 3 = 8
Number of stained sweaters
= 19 - 1 u
= 19 - 8
= 11
Answer(s): 11
