In a canteen,
45 of the pupils wore vests. After 175 pupils who wore vests left the canteen, the percentage of pupils who wore vests decreased to 10%. How many pupils in the canteen did not wear vests?
|
Wore vests |
Did not wear vests |
Before |
4x9 = 36 u |
1x9 = 9 u |
Change |
- 175 |
|
After |
1x1 = 1 u |
9x1 = 9 u |
10% =
10100 =
110The number of pupils who did not wear vests remains unchanged. LCM of 1 and 9 is 9.
Number of pupils who wore vests and left
= 36 u - 1 u
= 35 u
35 u = 175
1 u = 175 ÷ 35 = 5
Number of pupils who did not wear vests
= 9 u
= 9 x 5
= 45
Answer(s): 45