In a parade square,
89 of the pupils wore glasses. After 184 pupils who wore glasses left the parade square, the percentage of pupils who wore glasses decreased to 25%. How many pupils in the parade square did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
8x3 =
24 u |
1x3 =
3 u |
| Change |
- 184 |
|
| After |
1x1 =
1 u |
3x1 =
3 u |
25% =
25100 =
14The number of pupils who did not wear glasses remains unchanged. LCM of 1 and 3 is 3.
Number of pupils who wore glasses and left
= 24 u - 1 u
= 23 u
23 u = 184
1 u = 184 ÷ 23 = 8
Number of pupils who did not wear glasses
= 3 u
= 3 x 8
= 24
Answer(s): 24
