In a basketball court,
89 of the students wore vests. After 318 students who wore vests left the basketball court, the percentage of students who wore vests decreased to 30%. How many students in the basketball court did not wear vests?
| |
Wore vests |
Did not wear vests |
| Before |
8x7 =
56 u |
1x7 =
7 u |
| Change |
- 318 |
|
| After |
3x1 =
3 u |
7x1 =
7 u |
30% =
30100 =
310The number of students who did not wear vests remains unchanged. LCM of 1 and 7 is 7.
Number of students who wore vests and left
= 56 u - 3 u
= 53 u
53 u = 318
1 u = 318 ÷ 53 = 6
Number of students who did not wear vests
= 7 u
= 7 x 6
= 42
Answer(s): 42
