In a parade square,
15 of the girls wore spectacles. After 88 girls who wore spectacles entered the parade square, the percentage of girls who wore spectacles increased to 75%. How many girls in the parade square did not wear spectacles?
| |
Wore spectacles |
Did not wear spectacles |
| Before |
1x1 =
1 u |
4x1 =
4 u |
| Change |
+ 88 |
|
| After |
3x4 =
12 u |
1x4 =
4 u |
75% =
75100 =
34The number of girls who did not wear spectacles remains unchanged. LCM of 4 and 1 is 4.
Number of girls who wore spectacles and left
= 12 u - 1 u
= 11 u
11 u = 88
1 u = 88 ÷ 11 = 8
Number of girls who did not wear spectacles
= 4 u
= 4 x 8
= 32
Answer(s): 32
