In a hall,
29 of the students wore scarves. After 66 students who wore scarves left the hall, the percentage of students who wore scarves decreased to 10%. How many students in the hall did not wear scarves?
|
Wore scarves |
Did not wear scarves |
Before |
2x9 = 18 u |
7x9 = 63 u |
Change |
- 66 |
|
After |
1x7 = 7 u |
9x7 = 63 u |
10% =
10100 =
110The number of students who did not wear scarves remains unchanged. LCM of 7 and 9 is 63.
Number of students who wore scarves and left
= 18 u - 7 u
= 11 u
11 u = 66
1 u = 66 ÷ 11 = 6
Number of students who did not wear scarves
= 63 u
= 63 x 6
= 378
Answer(s): 378