On a shelf, there were 50 hoodies and skirts. Ivan spilt coffee on the shelf and stained 50% of the skirts and 25% of the hoodies. If 35 hoodies and skirts were still clean, how many clean skirts were there?
| |
Hoodies |
Skirts |
Total |
| Stained |
1 u |
1 p |
15 |
| Clean |
3 u |
1 p |
35 |
| Total |
4 u |
2 p |
50 |
50% =
50100 =
12 25% =
25100 =
14 Number of stained clothes
= 50 - 35
= 15
3 u + 1 p = 35
1 p = 35 - 3 u --- (1)
1 u + 1 p = 15
1 p = 15 - 1 u --- (2)
(2) - (1)
15 - 1 u = 35 - 3 u
3 u - 1 u = 35 - 15
2 u = 20
1 u = 20 ÷ 2 = 10
Number of clean skirts is the same as the number of stained skirts.
Number of clean skirts
= 15 - 1 u
= 15 - 10
= 5
Answer(s): 5
