In a hall,
14 of the pupils wore caps. After 33 pupils who wore caps entered the hall, the percentage of pupils who wore caps increased to 80%. How many pupils in the hall did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
1x1 = 1 u |
3x1 = 3 u |
Change |
+ 33 |
|
After |
4x3 = 12 u |
1x3 = 3 u |
80% =
80100 =
45The number of pupils who did not wear caps remains unchanged. LCM of 3 and 1 is 3.
Number of pupils who wore caps and left
= 12 u - 1 u
= 11 u
11 u = 33
1 u = 33 ÷ 11 = 3
Number of pupils who did not wear caps
= 3 u
= 3 x 3
= 9
Answer(s): 9