On a shelf, there were 97 jackets and hoodies. Oliver spilt hot tea on the shelf and stained 50% of the hoodies and 20% of the jackets. If 68 jackets and hoodies were still clean, how many stained hoodies were there?
|
Jackets |
Hoodies |
Total |
Stained |
1 u |
1 p |
29 |
Clean |
4 u |
1 p |
68 |
Total |
5 u |
2 p |
97 |
50% =
50100 =
12 20% =
20100 =
15 Number of stained clothes
= 97 - 68
= 29
4 u + 1 p = 68
1 p = 68 - 4 u --- (1)
1 u + 1 p = 29
1 p = 29 - 1 u --- (2)
(2) - (1)
29 - 1 u = 68 - 4 u
4 u - 1 u = 68 - 29
3 u = 39
1 u = 39 ÷ 3 = 13
Number of stained hoodies
= 29 - 1 u
= 29 - 13
= 16
Answer(s): 16