On a shelf, there were 148 skirts and blouses. Nick spilt soy milk on the shelf and stained 50% of the blouses and 10% of the skirts. If 118 skirts and blouses were still clean, how many clean blouses were there?
| |
Skirts |
Blouses |
Total |
| Stained |
1 u |
1 p |
30 |
| Clean |
9 u |
1 p |
118 |
| Total |
10 u |
2 p |
148 |
50% =
50100 =
12 10% =
10100 =
110 Number of stained clothes
= 148 - 118
= 30
9 u + 1 p = 118
1 p = 118 - 9 u --- (1)
1 u + 1 p = 30
1 p = 30 - 1 u --- (2)
(2) - (1)
30 - 1 u = 118 - 9 u
9 u - 1 u = 118 - 30
8 u = 88
1 u = 88 ÷ 8 = 11
Number of clean blouses is the same as the number of stained blouses.
Number of clean blouses
= 30 - 1 u
= 30 - 11
= 19
Answer(s): 19
