On a shelf, there were 104 skirts and hoodies. Reggie spilt soy milk on the shelf and stained 50% of the hoodies and 20% of the skirts. If 79 skirts and hoodies were still clean, how many clean hoodies were there?
| |
Skirts |
Hoodies |
Total |
| Stained |
1 u |
1 p |
25 |
| Clean |
4 u |
1 p |
79 |
| Total |
5 u |
2 p |
104 |
50% =
50100 =
12 20% =
20100 =
15 Number of stained clothes
= 104 - 79
= 25
4 u + 1 p = 79
1 p = 79 - 4 u --- (1)
1 u + 1 p = 25
1 p = 25 - 1 u --- (2)
(2) - (1)
25 - 1 u = 79 - 4 u
4 u - 1 u = 79 - 25
3 u = 54
1 u = 54 ÷ 3 = 18
Number of clean hoodies is the same as the number of stained hoodies.
Number of clean hoodies
= 25 - 1 u
= 25 - 18
= 7
Answer(s): 7
