In a hall,
67 of the boys wore spectacles. After 285 boys who wore spectacles left the hall, the percentage of boys who wore spectacles decreased to 45%. How many boys in the hall did not wear spectacles?
| |
Wore spectacles |
Did not wear spectacles |
| Before |
6x11 =
66 u |
1x11 =
11 u |
| Change |
- 285 |
|
| After |
9x1 =
9 u |
11x1 =
11 u |
45% =
45100 =
920The number of boys who did not wear spectacles remains unchanged. LCM of 1 and 11 is 11.
Number of boys who wore spectacles and left
= 66 u - 9 u
= 57 u
57 u = 285
1 u = 285 ÷ 57 = 5
Number of boys who did not wear spectacles
= 11 u
= 11 x 5
= 55
Answer(s): 55
