80% of the pupils are girls. 30% of the girls and 60% of the boys wear spectacles. What percentage of the pupils do not wear spectacles?
| Girls |
Boys |
Total |
| 80% |
20% |
100% |
| Wear spectacles |
Do not wear |
Wear spectacles |
Do not wear |
|
| 24% |
56% |
12% |
8% |
100% |
Number of girls who wear spectacles
= 30% x 80%
=
30100 x 80%
= 24%
Number of boys who wear spectacles
= 60% x 20%
=
60100 x 20%
= 12%
Percentage of pupils who wear spectacles
= 24% + 12%
= 36%
Percentage of pupils who do not wear spectacles
= 100% - 36%
= 64%
Answer: 64%
