In a hall,
910 of the boys wore glasses. After 600 boys who wore glasses left the hall, the percentage of boys who wore glasses decreased to 30%. How many boys in the hall did not wear glasses?
|
Wore glasses |
Did not wear glasses |
Before |
9x7 = 63 u |
1x7 = 7 u |
Change |
- 600 |
|
After |
3x1 = 3 u |
7x1 = 7 u |
30% =
30100 =
310The number of boys who did not wear glasses remains unchanged. LCM of 1 and 7 is 7.
Number of boys who wore glasses and left
= 63 u - 3 u
= 60 u
60 u = 600
1 u = 600 ÷ 60 = 10
Number of boys who did not wear glasses
= 7 u
= 7 x 10
= 70
Answer(s): 70