On a shelf, there were 86 sweaters and blouses. Warren spilt orange juice on the shelf and stained 50% of the blouses and 20% of the sweaters. If 58 sweaters and blouses were still clean, how many clean blouses were there?
| |
Sweaters |
Blouses |
Total |
| Stained |
1 u |
1 p |
28 |
| Clean |
4 u |
1 p |
58 |
| Total |
5 u |
2 p |
86 |
50% =
50100 =
12 20% =
20100 =
15 Number of stained clothes
= 86 - 58
= 28
4 u + 1 p = 58
1 p = 58 - 4 u --- (1)
1 u + 1 p = 28
1 p = 28 - 1 u --- (2)
(2) - (1)
28 - 1 u = 58 - 4 u
4 u - 1 u = 58 - 28
3 u = 30
1 u = 30 ÷ 3 = 10
Number of clean blouses is the same as the number of stained blouses.
Number of clean blouses
= 28 - 1 u
= 28 - 10
= 18
Answer(s): 18
