30% of the pupils are boys. 40% of the boys and 80% of the girls wear glasses. What percentage of the pupils do not wear glasses?
Boys |
Girls |
Total |
30% |
70% |
100% |
Wear glasses |
Do not wear |
Wear glasses |
Do not wear |
|
12% |
18% |
56% |
14% |
100% |
Number of boys who wear glasses
= 40% x 30%
=
40100 x 30%
= 12%
Number of girls who wear glasses
= 80% x 70%
=
80100 x 70%
= 56%
Percentage of pupils who wear glasses
= 12% + 56%
= 68%
Percentage of pupils who do not wear glasses
= 100% - 68%
= 32%
Answer: 32%