In a basketball court,
110 of the pupils wore vests. After 315 pupils who wore vests entered the basketball court, the percentage of pupils who wore vests increased to 80%. How many pupils in the basketball court did not wear vests?
|
Wore vests |
Did not wear vests |
Before |
1x1 = 1 u |
9x1 = 9 u |
Change |
+ 315 |
|
After |
4x9 = 36 u |
1x9 = 9 u |
80% =
80100 =
45The number of pupils who did not wear vests remains unchanged. LCM of 9 and 1 is 9.
Number of pupils who wore vests and left
= 36 u - 1 u
= 35 u
35 u = 315
1 u = 315 ÷ 35 = 9
Number of pupils who did not wear vests
= 9 u
= 9 x 9
= 81
Answer(s): 81