In a basketball court,
25 of the students wore vests. After 50 students who wore vests entered the basketball court, the percentage of students who wore vests increased to 80%. How many students in the basketball court did not wear vests?
| |
Wore vests |
Did not wear vests |
| Before |
2x1 =
2 u |
3x1 =
3 u |
| Change |
+ 50 |
|
| After |
4x3 =
12 u |
1x3 =
3 u |
80% =
80100 =
45The number of students who did not wear vests remains unchanged. LCM of 3 and 1 is 3.
Number of students who wore vests and left
= 12 u - 2 u
= 10 u
10 u = 50
1 u = 50 ÷ 10 = 5
Number of students who did not wear vests
= 3 u
= 3 x 5
= 15
Answer(s): 15
