In a basketball court,
35 of the girls wore cardigans. After 55 girls who wore cardigans entered the basketball court, the percentage of girls who wore cardigans increased to 80%. How many girls in the basketball court did not wear cardigans?
|
Wore cardigans |
Did not wear cardigans |
Before |
3x1 = 3 u |
2x1 = 2 u |
Change |
+ 55 |
|
After |
4x2 = 8 u |
1x2 = 2 u |
80% =
80100 =
45The number of girls who did not wear cardigans remains unchanged. LCM of 2 and 1 is 2.
Number of girls who wore cardigans and left
= 8 u - 3 u
= 5 u
5 u = 55
1 u = 55 ÷ 5 = 11
Number of girls who did not wear cardigans
= 2 u
= 2 x 11
= 22
Answer(s): 22