On a shelf, there were 86 jackets and shirts. Simon spilt coffee on the shelf and stained 50% of the shirts and 25% of the jackets. If 58 jackets and shirts were still clean, how many clean shirts were there?
| |
Jackets |
Shirts |
Total |
| Stained |
1 u |
1 p |
28 |
| Clean |
3 u |
1 p |
58 |
| Total |
4 u |
2 p |
86 |
50% =
50100 =
12 25% =
25100 =
14 Number of stained clothes
= 86 - 58
= 28
3 u + 1 p = 58
1 p = 58 - 3 u --- (1)
1 u + 1 p = 28
1 p = 28 - 1 u --- (2)
(2) - (1)
28 - 1 u = 58 - 3 u
3 u - 1 u = 58 - 28
2 u = 30
1 u = 30 ÷ 2 = 15
Number of clean shirts is the same as the number of stained shirts.
Number of clean shirts
= 28 - 1 u
= 28 - 15
= 13
Answer(s): 13
