In a hall,
78 of the students wore sweaters. After 184 students who wore sweaters left the hall, the percentage of students who wore sweaters decreased to 30%. How many students in the hall did not wear sweaters?
|
Wore sweaters |
Did not wear sweaters |
Before |
7x7 = 49 u |
1x7 = 7 u |
Change |
- 184 |
|
After |
3x1 = 3 u |
7x1 = 7 u |
30% =
30100 =
310The number of students who did not wear sweaters remains unchanged. LCM of 1 and 7 is 7.
Number of students who wore sweaters and left
= 49 u - 3 u
= 46 u
46 u = 184
1 u = 184 ÷ 46 = 4
Number of students who did not wear sweaters
= 7 u
= 7 x 4
= 28
Answer(s): 28