70% of the pupils are girls. 50% of the girls and 80% 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 |
|
| 35% |
35% |
24% |
6% |
100% |
Number of girls who wear glasses
= 50% x 70%
=
50100 x 70%
= 35%
Number of boys who wear glasses
= 80% x 30%
=
80100 x 30%
= 24%
Percentage of pupils who wear glasses
= 35% + 24%
= 59%
Percentage of pupils who do not wear glasses
= 100% - 59%
= 41%
Answer: 41%
