In a hall,
110 of the pupils wore vests. After 208 pupils who wore vests entered the hall, the percentage of pupils who wore vests increased to 75%. How many pupils in the hall did not wear vests?
|
Wore vests |
Did not wear vests |
Before |
1x1 = 1 u |
9x1 = 9 u |
Change |
+ 208 |
|
After |
3x9 = 27 u |
1x9 = 9 u |
75% =
75100 =
34The 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
= 27 u - 1 u
= 26 u
26 u = 208
1 u = 208 ÷ 26 = 8
Number of pupils who did not wear vests
= 9 u
= 9 x 8
= 72
Answer(s): 72