On a shelf, there were 62 skirts and shirts. Archie spilt juice on the shelf and stained 50% of the shirts and 10% of the skirts. If 47 skirts and shirts were still clean, how many clean shirts were there?
| |
Skirts |
Shirts |
Total |
| Stained |
1 u |
1 p |
15 |
| Clean |
9 u |
1 p |
47 |
| Total |
10 u |
2 p |
62 |
50% =
50100 =
12 10% =
10100 =
110 Number of stained clothes
= 62 - 47
= 15
9 u + 1 p = 47
1 p = 47 - 9 u --- (1)
1 u + 1 p = 15
1 p = 15 - 1 u --- (2)
(2) - (1)
15 - 1 u = 47 - 9 u
9 u - 1 u = 47 - 15
8 u = 32
1 u = 32 ÷ 8 = 4
Number of clean shirts is the same as the number of stained shirts.
Number of clean shirts
= 15 - 1 u
= 15 - 4
= 11
Answer(s): 11
