On a shelf, there were 86 blouses and skirts. Fabian spilt orange juice on the shelf and stained 50% of the skirts and 10% of the blouses. If 75 blouses and skirts were still clean, how many clean skirts were there?
| |
Blouses |
Skirts |
Total |
| Stained |
1 u |
1 p |
11 |
| Clean |
9 u |
1 p |
75 |
| Total |
10 u |
2 p |
86 |
50% =
50100 =
12 10% =
10100 =
110 Number of stained clothes
= 86 - 75
= 11
9 u + 1 p = 75
1 p = 75 - 9 u --- (1)
1 u + 1 p = 11
1 p = 11 - 1 u --- (2)
(2) - (1)
11 - 1 u = 75 - 9 u
9 u - 1 u = 75 - 11
8 u = 64
1 u = 64 ÷ 8 = 8
Number of clean skirts is the same as the number of stained skirts.
Number of clean skirts
= 11 - 1 u
= 11 - 8
= 3
Answer(s): 3
