In a hall,
310 of the students wore caps. After 165 students who wore caps entered the hall, the percentage of students who wore caps increased to 60%. How many students in the hall did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
3x2 = 6 u |
7x2 = 14 u |
Change |
+ 165 |
|
After |
3x7 = 21 u |
2x7 = 14 u |
60% =
60100 =
35The number of students who did not wear caps remains unchanged. LCM of 7 and 2 is 14.
Number of students who wore caps and left
= 21 u - 6 u
= 15 u
15 u = 165
1 u = 165 ÷ 15 = 11
Number of students who did not wear caps
= 14 u
= 14 x 11
= 154
Answer(s): 154