In a school field,
25 of the pupils wore cardigans. After 50 pupils who wore cardigans left the school field, the percentage of pupils who wore cardigans decreased to 10%. How many pupils in the school field did not wear cardigans?
|
Wore cardigans |
Did not wear cardigans |
Before |
2x3 = 6 u |
3x3 = 9 u |
Change |
- 50 |
|
After |
1x1 = 1 u |
9x1 = 9 u |
10% =
10100 =
110The number of pupils who did not wear cardigans remains unchanged. LCM of 3 and 9 is 9.
Number of pupils who wore cardigans and left
= 6 u - 1 u
= 5 u
5 u = 50
1 u = 50 ÷ 5 = 10
Number of pupils who did not wear cardigans
= 9 u
= 9 x 10
= 90
Answer(s): 90