20% of the pupils are boys. 70% of the boys and 80% of the girls wear spectacles. What percentage of the pupils do not wear spectacles?
Boys |
Girls |
Total |
20% |
80% |
100% |
Wear spectacles |
Do not wear |
Wear spectacles |
Do not wear |
|
14% |
6% |
64% |
16% |
100% |
Number of boys who wear spectacles
= 70% x 20%
=
70100 x 20%
= 14%
Number of girls who wear spectacles
= 80% x 80%
=
80100 x 80%
= 64%
Percentage of pupils who wear spectacles
= 14% + 64%
= 78%
Percentage of pupils who do not wear spectacles
= 100% - 78%
= 22%
Answer: 22%