In a tuckshop,
78 of the pupils wore caps. After 612 pupils who wore caps left the tuckshop, the percentage of pupils who wore caps decreased to 45%. How many pupils in the tuckshop did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
7x11 = 77 u |
1x11 = 11 u |
Change |
- 612 |
|
After |
9x1 = 9 u |
11x1 = 11 u |
45% =
45100 =
920The number of pupils who did not wear caps remains unchanged. LCM of 1 and 11 is 11.
Number of pupils who wore caps and left
= 77 u - 9 u
= 68 u
68 u = 612
1 u = 612 ÷ 68 = 9
Number of pupils who did not wear caps
= 11 u
= 11 x 9
= 99
Answer(s): 99