In a school field,
35 of the girls wore glasses. After 165 girls who wore glasses left the school field, the percentage of girls who wore glasses decreased to 45%. How many girls in the school field did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
3x11 =
33 u |
2x11 =
22 u |
| Change |
- 165 |
|
| After |
9x2 =
18 u |
11x2 =
22 u |
45% =
45100 =
920The number of girls who did not wear glasses remains unchanged. LCM of 2 and 11 is 22.
Number of girls who wore glasses and left
= 33 u - 18 u
= 15 u
15 u = 165
1 u = 165 ÷ 15 = 11
Number of girls who did not wear glasses
= 22 u
= 22 x 11
= 242
Answer(s): 242
