In a basketball court,
47 of the girls wore cardigans. After 64 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 |
4x1 = 4 u |
3x1 = 3 u |
Change |
+ 64 |
|
After |
4x3 = 12 u |
1x3 = 3 u |
80% =
80100 =
45The number of girls who did not wear cardigans remains unchanged. LCM of 3 and 1 is 3.
Number of girls who wore cardigans and left
= 12 u - 4 u
= 8 u
8 u = 64
1 u = 64 ÷ 8 = 8
Number of girls who did not wear cardigans
= 3 u
= 3 x 8
= 24
Answer(s): 24