In a hall,
67 of the girls wore spectacles. After 54 girls who wore spectacles left the hall, the percentage of girls who wore spectacles decreased to 60%. How many girls in the hall did not wear spectacles?
| |
Wore spectacles |
Did not wear spectacles |
| Before |
6x2 =
12 u |
1x2 =
2 u |
| Change |
- 54 |
|
| After |
3x1 =
3 u |
2x1 =
2 u |
60% =
60100 =
35The number of girls who did not wear spectacles remains unchanged. LCM of 1 and 2 is 2.
Number of girls who wore spectacles and left
= 12 u - 3 u
= 9 u
9 u = 54
1 u = 54 ÷ 9 = 6
Number of girls who did not wear spectacles
= 2 u
= 2 x 6
= 12
Answer(s): 12
