30% of the pupils are girls. 30% of the girls and 50% of the boys wear spectacles. What percentage of the pupils do not wear spectacles?
Girls |
Boys |
Total |
30% |
70% |
100% |
Wear spectacles |
Do not wear |
Wear spectacles |
Do not wear |
|
9% |
21% |
35% |
35% |
100% |
Number of girls who wear spectacles
= 30% x 30%
=
30100 x 30%
= 9%
Number of boys who wear spectacles
= 50% x 70%
=
50100 x 70%
= 35%
Percentage of pupils who wear spectacles
= 9% + 35%
= 44%
Percentage of pupils who do not wear spectacles
= 100% - 44%
= 56%
Answer: 56%