In a hall,
57 of the girls wore glasses. After 116 girls who wore glasses left the hall, the percentage of girls who wore glasses decreased to 30%. How many girls in the hall did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
5x7 =
35 u |
2x7 =
14 u |
| Change |
- 116 |
|
| After |
3x2 =
6 u |
7x2 =
14 u |
30% =
30100 =
310The number of girls who did not wear glasses remains unchanged. LCM of 2 and 7 is 14.
Number of girls who wore glasses and left
= 35 u - 6 u
= 29 u
29 u = 116
1 u = 116 ÷ 29 = 4
Number of girls who did not wear glasses
= 14 u
= 14 x 4
= 56
Answer(s): 56
