In a hall,
25 of the girls wore glasses. After 125 girls who wore glasses entered the hall, the percentage of girls who wore glasses increased to 90%. How many girls in the hall did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
2x1 =
2 u |
3x1 =
3 u |
| Change |
+ 125 |
|
| After |
9x3 =
27 u |
1x3 =
3 u |
90% =
90100 =
910The number of girls who did not wear glasses remains unchanged. LCM of 3 and 1 is 3.
Number of girls who wore glasses and left
= 27 u - 2 u
= 25 u
25 u = 125
1 u = 125 ÷ 25 = 5
Number of girls who did not wear glasses
= 3 u
= 3 x 5
= 15
Answer(s): 15
