In a hall,
89 of the pupils wore scarves. After 186 pupils who wore scarves left the hall, the percentage of pupils who wore scarves decreased to 20%. How many pupils in the hall did not wear scarves?
|
Wore scarves |
Did not wear scarves |
Before |
8x4 = 32 u |
1x4 = 4 u |
Change |
- 186 |
|
After |
1x1 = 1 u |
4x1 = 4 u |
20% =
20100 =
15The number of pupils who did not wear scarves remains unchanged. LCM of 1 and 4 is 4.
Number of pupils who wore scarves and left
= 32 u - 1 u
= 31 u
31 u = 186
1 u = 186 ÷ 31 = 6
Number of pupils who did not wear scarves
= 4 u
= 4 x 6
= 24
Answer(s): 24