In a parade square,
58 of the students wore sweaters. After 112 students who wore sweaters left the parade square, the percentage of students who wore sweaters decreased to 10%. How many students in the parade square did not wear sweaters?
|
Wore sweaters |
Did not wear sweaters |
Before |
5x3 = 15 u |
3x3 = 9 u |
Change |
- 112 |
|
After |
1x1 = 1 u |
9x1 = 9 u |
10% =
10100 =
110The number of students who did not wear sweaters remains unchanged. LCM of 3 and 9 is 9.
Number of students who wore sweaters and left
= 15 u - 1 u
= 14 u
14 u = 112
1 u = 112 ÷ 14 = 8
Number of students who did not wear sweaters
= 9 u
= 9 x 8
= 72
Answer(s): 72