In a parade square,
67 of the students wore cardigans. After 102 students who wore cardigans left the parade square, the percentage of students who wore cardigans decreased to 25%. How many students in the parade square did not wear cardigans?
| |
Wore cardigans |
Did not wear cardigans |
| Before |
6x3 =
18 u |
1x3 =
3 u |
| Change |
- 102 |
|
| After |
1x1 =
1 u |
3x1 =
3 u |
25% =
25100 =
14The number of students who did not wear cardigans remains unchanged. LCM of 1 and 3 is 3.
Number of students who wore cardigans and left
= 18 u - 1 u
= 17 u
17 u = 102
1 u = 102 ÷ 17 = 6
Number of students who did not wear cardigans
= 3 u
= 3 x 6
= 18
Answer(s): 18
