In a school field,
35 of the students wore sweaters. After 55 students who wore sweaters left the school field, the percentage of students who wore sweaters decreased to 20%. How many students in the school field did not wear sweaters?
|
Wore sweaters |
Did not wear sweaters |
Before |
3x2 = 6 u |
2x2 = 4 u |
Change |
- 55 |
|
After |
1x1 = 1 u |
4x1 = 4 u |
20% =
20100 =
15The number of students who did not wear sweaters remains unchanged. LCM of 2 and 4 is 4.
Number of students who wore sweaters and left
= 6 u - 1 u
= 5 u
5 u = 55
1 u = 55 ÷ 5 = 11
Number of students who did not wear sweaters
= 4 u
= 4 x 11
= 44
Answer(s): 44