On a shelf, there were 134 blouses and shirts. Charlie spilt orange juice on the shelf and stained 50% of the shirts and 10% of the blouses. If 115 blouses and shirts were still clean, how many clean shirts were there?
| |
Blouses |
Shirts |
Total |
| Stained |
1 u |
1 p |
19 |
| Clean |
9 u |
1 p |
115 |
| Total |
10 u |
2 p |
134 |
50% =
50100 =
12 10% =
10100 =
110 Number of stained clothes
= 134 - 115
= 19
9 u + 1 p = 115
1 p = 115 - 9 u --- (1)
1 u + 1 p = 19
1 p = 19 - 1 u --- (2)
(2) - (1)
19 - 1 u = 115 - 9 u
9 u - 1 u = 115 - 19
8 u = 96
1 u = 96 ÷ 8 = 12
Number of clean shirts is the same as the number of stained shirts.
Number of clean shirts
= 19 - 1 u
= 19 - 12
= 7
Answer(s): 7
