In a school field,
56 of the pupils wore vests. After 114 pupils who wore vests left the school field, the percentage of pupils who wore vests decreased to 20%. How many pupils in the school field did not wear vests?
|
Wore vests |
Did not wear vests |
Before |
5x4 = 20 u |
1x4 = 4 u |
Change |
- 114 |
|
After |
1x1 = 1 u |
4x1 = 4 u |
20% =
20100 =
15The number of pupils who did not wear vests remains unchanged. LCM of 1 and 4 is 4.
Number of pupils who wore vests and left
= 20 u - 1 u
= 19 u
19 u = 114
1 u = 114 ÷ 19 = 6
Number of pupils who did not wear vests
= 4 u
= 4 x 6
= 24
Answer(s): 24