In a basketball court,
13 of the girls wore glasses. After 85 girls who wore glasses entered the basketball court, the percentage of girls who wore glasses increased to 90%. How many girls in the basketball court did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
1x1 =
1 u |
2x1 =
2 u |
| Change |
+ 85 |
|
| After |
9x2 =
18 u |
1x2 =
2 u |
90% =
90100 =
910The number of girls who did not wear glasses remains unchanged. LCM of 2 and 1 is 2.
Number of girls who wore glasses and left
= 18 u - 1 u
= 17 u
17 u = 85
1 u = 85 ÷ 17 = 5
Number of girls who did not wear glasses
= 2 u
= 2 x 5
= 10
Answer(s): 10
