In a school field,
47 of the students wore scarves. After 30 students who wore scarves entered the school field, the percentage of students who wore scarves increased to 75%. How many students in the school field did not wear scarves?
|
Wore scarves |
Did not wear scarves |
Before |
4x1 = 4 u |
3x1 = 3 u |
Change |
+ 30 |
|
After |
3x3 = 9 u |
1x3 = 3 u |
75% =
75100 =
34The number of students who did not wear scarves remains unchanged. LCM of 3 and 1 is 3.
Number of students who wore scarves and left
= 9 u - 4 u
= 5 u
5 u = 30
1 u = 30 ÷ 5 = 6
Number of students who did not wear scarves
= 3 u
= 3 x 6
= 18
Answer(s): 18