In a canteen,
59 of the pupils wore caps. After 22 pupils who wore caps entered the canteen, the percentage of pupils who wore caps increased to 80%. How many pupils in the canteen did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
5x1 = 5 u |
4x1 = 4 u |
Change |
+ 22 |
|
After |
4x4 = 16 u |
1x4 = 4 u |
80% =
80100 =
45The number of pupils who did not wear caps remains unchanged. LCM of 4 and 1 is 4.
Number of pupils who wore caps and left
= 16 u - 5 u
= 11 u
11 u = 22
1 u = 22 ÷ 11 = 2
Number of pupils who did not wear caps
= 4 u
= 4 x 2
= 8
Answer(s): 8