70% of the pupils are girls. 30% of the girls and 50% of the boys wear glasses. What percentage of the pupils do not wear glasses?
| Girls |
Boys |
Total |
| 70% |
30% |
100% |
| Wear glasses |
Do not wear |
Wear glasses |
Do not wear |
|
| 21% |
49% |
15% |
15% |
100% |
Number of girls who wear glasses
= 30% x 70%
=
30100 x 70%
= 21%
Number of boys who wear glasses
= 50% x 30%
=
50100 x 30%
= 15%
Percentage of pupils who wear glasses
= 21% + 15%
= 36%
Percentage of pupils who do not wear glasses
= 100% - 36%
= 64%
Answer: 64%
