In a hall,
89 of the children wore glasses. After 138 children who wore glasses left the hall, the percentage of children who wore glasses decreased to 25%. How many children in the hall did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
8x3 =
24 u |
1x3 =
3 u |
| Change |
- 138 |
|
| After |
1x1 =
1 u |
3x1 =
3 u |
25% =
25100 =
14The number of children who did not wear glasses remains unchanged. LCM of 1 and 3 is 3.
Number of children who wore glasses and left
= 24 u - 1 u
= 23 u
23 u = 138
1 u = 138 ÷ 23 = 6
Number of children who did not wear glasses
= 3 u
= 3 x 6
= 18
Answer(s): 18
