In a basketball court,
710 of the students wore glasses. After 160 students who wore glasses entered the basketball court, the percentage of students who wore glasses increased to 90%. How many students in the basketball court did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
7x1 =
7 u |
3x1 =
3 u |
| Change |
+ 160 |
|
| After |
9x3 =
27 u |
1x3 =
3 u |
90% =
90100 =
910The number of students who did not wear glasses remains unchanged. LCM of 3 and 1 is 3.
Number of students who wore glasses and left
= 27 u - 7 u
= 20 u
20 u = 160
1 u = 160 ÷ 20 = 8
Number of students who did not wear glasses
= 3 u
= 3 x 8
= 24
Answer(s): 24
