50% of the pupils are girls. 30% of the girls and 80% of the boys wear glasses. What percentage of the pupils do not wear glasses?
| Girls |
Boys |
Total |
| 50% |
50% |
100% |
| Wear glasses |
Do not wear |
Wear glasses |
Do not wear |
|
| 15% |
35% |
40% |
10% |
100% |
Number of girls who wear glasses
= 30% x 50%
=
30100 x 50%
= 15%
Number of boys who wear glasses
= 80% x 50%
=
80100 x 50%
= 40%
Percentage of pupils who wear glasses
= 15% + 40%
= 55%
Percentage of pupils who do not wear glasses
= 100% - 55%
= 45%
Answer: 45%
