70% of the students are boys. 40% of the boys and 70% of the girls wear glasses. What percentage of the students do not wear glasses?
Boys |
Girls |
Total |
70% |
30% |
100% |
Wear glasses |
Do not wear |
Wear glasses |
Do not wear |
|
28% |
42% |
21% |
9% |
100% |
Number of boys who wear glasses
= 40% x 70%
=
40100 x 70%
= 28%
Number of girls who wear glasses
= 70% x 30%
=
70100 x 30%
= 21%
Percentage of students who wear glasses
= 28% + 21%
= 49%
Percentage of students who do not wear glasses
= 100% - 49%
= 51%
Answer: 51%