On a shelf, there were 116 shirts and jackets. Ben spilt coffee on the shelf and stained 50% of the jackets and 10% of the shirts. If 94 shirts and jackets were still clean, how many clean jackets were there?
| |
Shirts |
Jackets |
Total |
| Stained |
1 u |
1 p |
22 |
| Clean |
9 u |
1 p |
94 |
| Total |
10 u |
2 p |
116 |
50% =
50100 =
12 10% =
10100 =
110 Number of stained clothes
= 116 - 94
= 22
9 u + 1 p = 94
1 p = 94 - 9 u --- (1)
1 u + 1 p = 22
1 p = 22 - 1 u --- (2)
(2) - (1)
22 - 1 u = 94 - 9 u
9 u - 1 u = 94 - 22
8 u = 72
1 u = 72 ÷ 8 = 9
Number of clean jackets is the same as the number of stained jackets.
Number of clean jackets
= 22 - 1 u
= 22 - 9
= 13
Answer(s): 13
