In a hall,
47 of the students wore cardigans. After 26 students who wore cardigans left the hall, the percentage of students who wore cardigans decreased to 20%. How many students in the hall did not wear cardigans?
| |
Wore cardigans |
Did not wear cardigans |
| Before |
4x4 =
16 u |
3x4 =
12 u |
| Change |
- 26 |
|
| After |
1x3 =
3 u |
4x3 =
12 u |
20% =
20100 =
15The number of students who did not wear cardigans remains unchanged. LCM of 3 and 4 is 12.
Number of students who wore cardigans and left
= 16 u - 3 u
= 13 u
13 u = 26
1 u = 26 ÷ 13 = 2
Number of students who did not wear cardigans
= 12 u
= 12 x 2
= 24
Answer(s): 24
