In a school field,
78 of the students wore glasses. After 496 students who wore glasses left the school field, the percentage of students who wore glasses decreased to 10%. How many students in the school field did not wear glasses?
|
Wore glasses |
Did not wear glasses |
Before |
7x9 = 63 u |
1x9 = 9 u |
Change |
- 496 |
|
After |
1x1 = 1 u |
9x1 = 9 u |
10% =
10100 =
110The number of students who did not wear glasses remains unchanged. LCM of 1 and 9 is 9.
Number of students who wore glasses and left
= 63 u - 1 u
= 62 u
62 u = 496
1 u = 496 ÷ 62 = 8
Number of students who did not wear glasses
= 9 u
= 9 x 8
= 72
Answer(s): 72