90% of the students are boys. 50% of the boys and 80% of the girls wear glasses. What percentage of the students do not wear glasses?
Boys |
Girls |
Total |
90% |
10% |
100% |
Wear glasses |
Do not wear |
Wear glasses |
Do not wear |
|
45% |
45% |
8% |
2% |
100% |
Number of boys who wear glasses
= 50% x 90%
=
50100 x 90%
= 45%
Number of girls who wear glasses
= 80% x 10%
=
80100 x 10%
= 8%
Percentage of students who wear glasses
= 45% + 8%
= 53%
Percentage of students who do not wear glasses
= 100% - 53%
= 47%
Answer: 47%