30% of the pupils are boys. 30% of the boys and 40% of the girls wear spectacles. What percentage of the pupils do not wear spectacles?
| Boys |
Girls |
Total |
| 30% |
70% |
100% |
| Wear spectacles |
Do not wear |
Wear spectacles |
Do not wear |
|
| 9% |
21% |
28% |
42% |
100% |
Number of boys who wear spectacles
= 30% x 30%
=
30100 x 30%
= 9%
Number of girls who wear spectacles
= 40% x 70%
=
40100 x 70%
= 28%
Percentage of pupils who wear spectacles
= 9% + 28%
= 37%
Percentage of pupils who do not wear spectacles
= 100% - 37%
= 63%
Answer: 63%
