In a parade square,
56 of the students wore sweaters. After 76 students who wore sweaters left the parade square, the percentage of students who wore sweaters decreased to 20%. How many students in the parade square did not wear sweaters?
|
Wore sweaters |
Did not wear sweaters |
Before |
5x4 = 20 u |
1x4 = 4 u |
Change |
- 76 |
|
After |
1x1 = 1 u |
4x1 = 4 u |
20% =
20100 =
15The number of students who did not wear sweaters remains unchanged. LCM of 1 and 4 is 4.
Number of students who wore sweaters and left
= 20 u - 1 u
= 19 u
19 u = 76
1 u = 76 ÷ 19 = 4
Number of students who did not wear sweaters
= 4 u
= 4 x 4
= 16
Answer(s): 16