In a basketball court,
47 of the girls wore cardigans. After 92 girls who wore cardigans entered the basketball court, the percentage of girls who wore cardigans increased to 90%. 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 |
+ 92 |
|
After |
9x3 = 27 u |
1x3 = 3 u |
90% =
90100 =
910The 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
= 27 u - 4 u
= 23 u
23 u = 92
1 u = 92 ÷ 23 = 4
Number of girls who did not wear cardigans
= 3 u
= 3 x 4
= 12
Answer(s): 12