In a school field,
89 of the boys wore cardigans. After 207 boys who wore cardigans left the school field, the percentage of boys who wore cardigans decreased to 25%. How many boys in the school field did not wear cardigans?
|
Wore cardigans |
Did not wear cardigans |
Before |
8x3 = 24 u |
1x3 = 3 u |
Change |
- 207 |
|
After |
1x1 = 1 u |
3x1 = 3 u |
25% =
25100 =
14The number of boys who did not wear cardigans remains unchanged. LCM of 1 and 3 is 3.
Number of boys who wore cardigans and left
= 24 u - 1 u
= 23 u
23 u = 207
1 u = 207 ÷ 23 = 9
Number of boys who did not wear cardigans
= 3 u
= 3 x 9
= 27
Answer(s): 27