On a shelf, there were 91 blouses and sweaters. Will spilt orange juice on the shelf and stained 50% of the sweaters and 20% of the blouses. If 62 blouses and sweaters were still clean, how many clean sweaters were there?
| |
Blouses |
Sweaters |
Total |
| Stained |
1 u |
1 p |
29 |
| Clean |
4 u |
1 p |
62 |
| Total |
5 u |
2 p |
91 |
50% =
50100 =
12 20% =
20100 =
15 Number of stained clothes
= 91 - 62
= 29
4 u + 1 p = 62
1 p = 62 - 4 u --- (1)
1 u + 1 p = 29
1 p = 29 - 1 u --- (2)
(2) - (1)
29 - 1 u = 62 - 4 u
4 u - 1 u = 62 - 29
3 u = 33
1 u = 33 ÷ 3 = 11
Number of clean sweaters is the same as the number of stained sweaters.
Number of clean sweaters
= 29 - 1 u
= 29 - 11
= 18
Answer(s): 18
