In a parade square,
47 of the pupils wore cardigans. After 102 pupils who wore cardigans left the parade square, the percentage of pupils who wore cardigans decreased to 45%. How many pupils in the parade square did not wear cardigans?
|
Wore cardigans |
Did not wear cardigans |
Before |
4x11 = 44 u |
3x11 = 33 u |
Change |
- 102 |
|
After |
9x3 = 27 u |
11x3 = 33 u |
45% =
45100 =
920The number of pupils who did not wear cardigans remains unchanged. LCM of 3 and 11 is 33.
Number of pupils who wore cardigans and left
= 44 u - 27 u
= 17 u
17 u = 102
1 u = 102 ÷ 17 = 6
Number of pupils who did not wear cardigans
= 33 u
= 33 x 6
= 198
Answer(s): 198