In a parade square,
29 of the students wore vests. After 88 students who wore vests left the parade square, the percentage of students who wore vests decreased to 10%. How many students in the parade square did not wear vests?
|
Wore vests |
Did not wear vests |
Before |
2x9 = 18 u |
7x9 = 63 u |
Change |
- 88 |
|
After |
1x7 = 7 u |
9x7 = 63 u |
10% =
10100 =
110The number of students who did not wear vests remains unchanged. LCM of 7 and 9 is 63.
Number of students who wore vests and left
= 18 u - 7 u
= 11 u
11 u = 88
1 u = 88 ÷ 11 = 8
Number of students who did not wear vests
= 63 u
= 63 x 8
= 504
Answer(s): 504