On a shelf, there were 43 skirts and cardigans. Lee spilt coffee on the shelf and stained 50% of the cardigans and 20% of the skirts. If 29 skirts and cardigans were still clean, how many clean cardigans were there?
| |
Skirts |
Cardigans |
Total |
| Stained |
1 u |
1 p |
14 |
| Clean |
4 u |
1 p |
29 |
| Total |
5 u |
2 p |
43 |
50% =
50100 =
12 20% =
20100 =
15 Number of stained clothes
= 43 - 29
= 14
4 u + 1 p = 29
1 p = 29 - 4 u --- (1)
1 u + 1 p = 14
1 p = 14 - 1 u --- (2)
(2) - (1)
14 - 1 u = 29 - 4 u
4 u - 1 u = 29 - 14
3 u = 15
1 u = 15 ÷ 3 = 5
Number of clean cardigans is the same as the number of stained cardigans.
Number of clean cardigans
= 14 - 1 u
= 14 - 5
= 9
Answer(s): 9
