In a parade square,
37 of the students wore ties. After 45 students who wore ties entered the parade square, the percentage of students who wore ties increased to 75%. How many students in the parade square did not wear ties?
|
Wore ties |
Did not wear ties |
Before |
3x1 = 3 u |
4x1 = 4 u |
Change |
+ 45 |
|
After |
3x4 = 12 u |
1x4 = 4 u |
75% =
75100 =
34The number of students who did not wear ties remains unchanged. LCM of 4 and 1 is 4.
Number of students who wore ties and left
= 12 u - 3 u
= 9 u
9 u = 45
1 u = 45 ÷ 9 = 5
Number of students who did not wear ties
= 4 u
= 4 x 5
= 20
Answer(s): 20