In a hall,
16 of the students wore glasses. After 396 students who wore glasses entered the hall, the percentage of students who wore glasses increased to 90%. How many students in the hall did not wear glasses?
|
Wore glasses |
Did not wear glasses |
Before |
1x1 = 1 u |
5x1 = 5 u |
Change |
+ 396 |
|
After |
9x5 = 45 u |
1x5 = 5 u |
90% =
90100 =
910The number of students who did not wear glasses remains unchanged. LCM of 5 and 1 is 5.
Number of students who wore glasses and left
= 45 u - 1 u
= 44 u
44 u = 396
1 u = 396 ÷ 44 = 9
Number of students who did not wear glasses
= 5 u
= 5 x 9
= 45
Answer(s): 45