In a parade square,
14 of the students wore sweaters. After 6 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 |
1x3 =
3 u |
3x3 =
9 u |
| Change |
- 6 |
|
| 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
= 3 u - 1 u
= 2 u
2 u = 6
1 u = 6 ÷ 2 = 3
Number of students who did not wear sweaters
= 9 u
= 9 x 3
= 27
Answer(s): 27
