In a basketball court,
35 of the girls wore scarves. After 165 girls who wore scarves entered the basketball court, the percentage of girls who wore scarves increased to 90%. How many girls in the basketball court did not wear scarves?
| |
Wore scarves |
Did not wear scarves |
| Before |
3x1 =
3 u |
2x1 =
2 u |
| Change |
+ 165 |
|
| After |
9x2 =
18 u |
1x2 =
2 u |
90% =
90100 =
910The number of girls who did not wear scarves remains unchanged. LCM of 2 and 1 is 2.
Number of girls who wore scarves and left
= 18 u - 3 u
= 15 u
15 u = 165
1 u = 165 ÷ 15 = 11
Number of girls who did not wear scarves
= 2 u
= 2 x 11
= 22
Answer(s): 22
