In a parade square,
35 of the students wore vests. After 35 students who wore vests entered the parade square, the percentage of students who wore vests increased to 70%. How many students in the parade square did not wear vests?
| |
Wore vests |
Did not wear vests |
| Before |
3x3 =
9 u |
2x3 =
6 u |
| Change |
+ 35 |
|
| After |
7x2 =
14 u |
3x2 =
6 u |
70% =
70100 =
710The number of students who did not wear vests remains unchanged. LCM of 2 and 3 is 6.
Number of students who wore vests and left
= 14 u - 9 u
= 5 u
5 u = 35
1 u = 35 ÷ 5 = 7
Number of students who did not wear vests
= 6 u
= 6 x 7
= 42
Answer(s): 42
