In a hall,
57 of the girls wore scarves. After 301 girls who wore scarves left the hall, the percentage of girls who wore scarves decreased to 10%. How many girls in the hall did not wear scarves?
| |
Wore scarves |
Did not wear scarves |
| Before |
5x9 =
45 u |
2x9 =
18 u |
| Change |
- 301 |
|
| After |
1x2 =
2 u |
9x2 =
18 u |
10% =
10100 =
110The number of girls who did not wear scarves remains unchanged. LCM of 2 and 9 is 18.
Number of girls who wore scarves and left
= 45 u - 2 u
= 43 u
43 u = 301
1 u = 301 ÷ 43 = 7
Number of girls who did not wear scarves
= 18 u
= 18 x 7
= 126
Answer(s): 126
