In a parade square,
16 of the students wore glasses. After 143 students who wore glasses entered the parade square, the percentage of students who wore glasses increased to 60%. How many students in the parade square did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
1x2 =
2 u |
5x2 =
10 u |
| Change |
+ 143 |
|
| After |
3x5 =
15 u |
2x5 =
10 u |
60% =
60100 =
35The number of students who did not wear glasses remains unchanged. LCM of 5 and 2 is 10.
Number of students who wore glasses and left
= 15 u - 2 u
= 13 u
13 u = 143
1 u = 143 ÷ 13 = 11
Number of students who did not wear glasses
= 10 u
= 10 x 11
= 110
Answer(s): 110
