In a school field,
25 of the girls wore scarves. After 45 girls who wore scarves left the school field, the percentage of girls who wore scarves decreased to 10%. How many girls in the school field did not wear scarves?
|
Wore scarves |
Did not wear scarves |
Before |
2x3 = 6 u |
3x3 = 9 u |
Change |
- 45 |
|
After |
1x1 = 1 u |
9x1 = 9 u |
10% =
10100 =
110The number of girls who did not wear scarves remains unchanged. LCM of 3 and 9 is 9.
Number of girls who wore scarves and left
= 6 u - 1 u
= 5 u
5 u = 45
1 u = 45 ÷ 5 = 9
Number of girls who did not wear scarves
= 9 u
= 9 x 9
= 81
Answer(s): 81