In a canteen,
13 of the students wore glasses. After 63 students who wore glasses left the canteen, the percentage of students who wore glasses decreased to 10%. How many students in the canteen did not wear glasses?
|
Wore glasses |
Did not wear glasses |
Before |
1x9 = 9 u |
2x9 = 18 u |
Change |
- 63 |
|
After |
1x2 = 2 u |
9x2 = 18 u |
10% =
10100 =
110The number of students who did not wear glasses remains unchanged. LCM of 2 and 9 is 18.
Number of students who wore glasses and left
= 9 u - 2 u
= 7 u
7 u = 63
1 u = 63 ÷ 7 = 9
Number of students who did not wear glasses
= 18 u
= 18 x 9
= 162
Answer(s): 162