In a tuckshop,
38 of the pupils wore scarves. After 90 pupils who wore scarves entered the tuckshop, the percentage of pupils who wore scarves increased to 60%. How many pupils in the tuckshop did not wear scarves?
|
Wore scarves |
Did not wear scarves |
Before |
3x2 = 6 u |
5x2 = 10 u |
Change |
+ 90 |
|
After |
3x5 = 15 u |
2x5 = 10 u |
60% =
60100 =
35The number of pupils who did not wear scarves remains unchanged. LCM of 5 and 2 is 10.
Number of pupils who wore scarves and left
= 15 u - 6 u
= 9 u
9 u = 90
1 u = 90 ÷ 9 = 10
Number of pupils who did not wear scarves
= 10 u
= 10 x 10
= 100
Answer(s): 100