In a canteen,
47 of the girls wore spectacles. After 119 girls who wore spectacles left the canteen, the percentage of girls who wore spectacles decreased to 45%. How many girls in the canteen did not wear spectacles?
| |
Wore spectacles |
Did not wear spectacles |
| Before |
4x11 =
44 u |
3x11 =
33 u |
| Change |
- 119 |
|
| After |
9x3 =
27 u |
11x3 =
33 u |
45% =
45100 =
920The number of girls who did not wear spectacles remains unchanged. LCM of 3 and 11 is 33.
Number of girls who wore spectacles and left
= 44 u - 27 u
= 17 u
17 u = 119
1 u = 119 ÷ 17 = 7
Number of girls who did not wear spectacles
= 33 u
= 33 x 7
= 231
Answer(s): 231
