In a parade square,
38 of the pupils wore caps. After 154 pupils who wore caps left the parade square, the percentage of pupils who wore caps decreased to 10%. How many pupils in the parade square did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
3x9 = 27 u |
5x9 = 45 u |
Change |
- 154 |
|
After |
1x5 = 5 u |
9x5 = 45 u |
10% =
10100 =
110The number of pupils who did not wear caps remains unchanged. LCM of 5 and 9 is 45.
Number of pupils who wore caps and left
= 27 u - 5 u
= 22 u
22 u = 154
1 u = 154 ÷ 22 = 7
Number of pupils who did not wear caps
= 45 u
= 45 x 7
= 315
Answer(s): 315