In a hall,
59 of the pupils wore caps. After 164 pupils who wore caps left the hall, the percentage of pupils who wore caps decreased to 10%. How many pupils in the hall did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
5x9 = 45 u |
4x9 = 36 u |
Change |
- 164 |
|
After |
1x4 = 4 u |
9x4 = 36 u |
10% =
10100 =
110The number of pupils who did not wear caps remains unchanged. LCM of 4 and 9 is 36.
Number of pupils who wore caps and left
= 45 u - 4 u
= 41 u
41 u = 164
1 u = 164 ÷ 41 = 4
Number of pupils who did not wear caps
= 36 u
= 36 x 4
= 144
Answer(s): 144