In a basketball court,
35 of the girls wore cardigans. After 18 girls who wore cardigans entered the basketball court, the percentage of girls who wore cardigans increased to 75%. 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 |
+ 18 |
|
| After |
3x2 =
6 u |
1x2 =
2 u |
75% =
75100 =
34The 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
= 6 u - 3 u
= 3 u
3 u = 18
1 u = 18 ÷ 3 = 6
Number of girls who did not wear cardigans
= 2 u
= 2 x 6
= 12
Answer(s): 12
