On a shelf, there were 128 hoodies and cardigans. Mark spilt hot tea on the shelf and stained 50% of the cardigans and 20% of the hoodies. If 91 hoodies and cardigans were still clean, how many stained cardigans were there?
| |
Hoodies |
Cardigans |
Total |
| Stained |
1 u |
1 p |
37 |
| Clean |
4 u |
1 p |
91 |
| Total |
5 u |
2 p |
128 |
50% =
50100 =
12 20% =
20100 =
15 Number of stained clothes
= 128 - 91
= 37
4 u + 1 p = 91
1 p = 91 - 4 u --- (1)
1 u + 1 p = 37
1 p = 37 - 1 u --- (2)
(2) - (1)
37 - 1 u = 91 - 4 u
4 u - 1 u = 91 - 37
3 u = 54
1 u = 54 ÷ 3 = 18
Number of stained cardigans
= 37 - 1 u
= 37 - 18
= 19
Answer(s): 19
