In a school field,
89 of the girls wore spectacles. After 130 girls who wore spectacles left the school field, the percentage of girls who wore spectacles decreased to 60%. How many girls in the school field did not wear spectacles?
| |
Wore spectacles |
Did not wear spectacles |
| Before |
8x2 =
16 u |
1x2 =
2 u |
| Change |
- 130 |
|
| 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
= 16 u - 3 u
= 13 u
13 u = 130
1 u = 130 ÷ 13 = 10
Number of girls who did not wear spectacles
= 2 u
= 2 x 10
= 20
Answer(s): 20
