In a basketball court,
710 of the students wore ties. After 150 students who wore ties left the basketball court, the percentage of students who wore ties decreased to 20%. How many students in the basketball court did not wear ties?
| |
Wore ties |
Did not wear ties |
| Before |
7x4 =
28 u |
3x4 =
12 u |
| Change |
- 150 |
|
| After |
1x3 =
3 u |
4x3 =
12 u |
20% =
20100 =
15The number of students who did not wear ties remains unchanged. LCM of 3 and 4 is 12.
Number of students who wore ties and left
= 28 u - 3 u
= 25 u
25 u = 150
1 u = 150 ÷ 25 = 6
Number of students who did not wear ties
= 12 u
= 12 x 6
= 72
Answer(s): 72
