On a shelf, there were 186 skirts and hoodies. Lee spilt hot tea on the shelf and stained 50% of the hoodies and 10% of the skirts. If 153 skirts and hoodies were still clean, how many stained hoodies were there?
| |
Skirts |
Hoodies |
Total |
| Stained |
1 u |
1 p |
33 |
| Clean |
9 u |
1 p |
153 |
| Total |
10 u |
2 p |
186 |
50% =
50100 =
12 10% =
10100 =
110 Number of stained clothes
= 186 - 153
= 33
9 u + 1 p = 153
1 p = 153 - 9 u --- (1)
1 u + 1 p = 33
1 p = 33 - 1 u --- (2)
(2) - (1)
33 - 1 u = 153 - 9 u
9 u - 1 u = 153 - 33
8 u = 120
1 u = 120 ÷ 8 = 15
Number of stained hoodies
= 33 - 1 u
= 33 - 15
= 18
Answer(s): 18
