In a tuckshop,
79 of the girls wore glasses. After 171 girls who wore glasses left the tuckshop, the percentage of girls who wore glasses decreased to 25%. How many girls in the tuckshop did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
7x3 =
21 u |
2x3 =
6 u |
| Change |
- 171 |
|
| After |
1x2 =
2 u |
3x2 =
6 u |
25% =
25100 =
14The number of girls who did not wear glasses remains unchanged. LCM of 2 and 3 is 6.
Number of girls who wore glasses and left
= 21 u - 2 u
= 19 u
19 u = 171
1 u = 171 ÷ 19 = 9
Number of girls who did not wear glasses
= 6 u
= 6 x 9
= 54
Answer(s): 54
