In a school field,
38 of the students wore scarves. After 35 students who wore scarves left the school field, the percentage of students who wore scarves decreased to 20%. How many students in the school field did not wear scarves?
| |
Wore scarves |
Did not wear scarves |
| Before |
3x4 =
12 u |
5x4 =
20 u |
| Change |
- 35 |
|
| After |
1x5 =
5 u |
4x5 =
20 u |
20% =
20100 =
15The number of students who did not wear scarves remains unchanged. LCM of 5 and 4 is 20.
Number of students who wore scarves and left
= 12 u - 5 u
= 7 u
7 u = 35
1 u = 35 ÷ 7 = 5
Number of students who did not wear scarves
= 20 u
= 20 x 5
= 100
Answer(s): 100
