In a canteen,
16 of the pupils wore scarves. After 132 pupils who wore scarves entered the canteen, the percentage of pupils who wore scarves increased to 90%. How many pupils in the canteen did not wear scarves?
|
Wore scarves |
Did not wear scarves |
Before |
1x1 = 1 u |
5x1 = 5 u |
Change |
+ 132 |
|
After |
9x5 = 45 u |
1x5 = 5 u |
90% =
90100 =
910The number of pupils who did not wear scarves remains unchanged. LCM of 5 and 1 is 5.
Number of pupils who wore scarves and left
= 45 u - 1 u
= 44 u
44 u = 132
1 u = 132 ÷ 44 = 3
Number of pupils who did not wear scarves
= 5 u
= 5 x 3
= 15
Answer(s): 15