In a canteen,
38 of the students wore ties. After 24 students who wore ties left the canteen, the percentage of students who wore ties decreased to 30%. How many students in the canteen did not wear ties?
|
Wore ties |
Did not wear ties |
Before |
3x7 = 21 u |
5x7 = 35 u |
Change |
- 24 |
|
After |
3x5 = 15 u |
7x5 = 35 u |
30% =
30100 =
310The number of students who did not wear ties remains unchanged. LCM of 5 and 7 is 35.
Number of students who wore ties and left
= 21 u - 15 u
= 6 u
6 u = 24
1 u = 24 ÷ 6 = 4
Number of students who did not wear ties
= 35 u
= 35 x 4
= 140
Answer(s): 140