In a basketball court,
89 of the pupils wore vests. After 341 pupils who wore vests left the basketball court, the percentage of pupils who wore vests decreased to 20%. How many pupils in the basketball court did not wear vests?
| |
Wore vests |
Did not wear vests |
| Before |
8x4 =
32 u |
1x4 =
4 u |
| Change |
- 341 |
|
| 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
= 32 u - 1 u
= 31 u
31 u = 341
1 u = 341 ÷ 31 = 11
Number of pupils who did not wear vests
= 4 u
= 4 x 11
= 44
Answer(s): 44
