40% of the pupils are girls. 30% of the girls and 40% of the boys wear glasses. What percentage of the pupils do not wear glasses?
Girls |
Boys |
Total |
40% |
60% |
100% |
Wear glasses |
Do not wear |
Wear glasses |
Do not wear |
|
12% |
28% |
24% |
36% |
100% |
Number of girls who wear glasses
= 30% x 40%
=
30100 x 40%
= 12%
Number of boys who wear glasses
= 40% x 60%
=
40100 x 60%
= 24%
Percentage of pupils who wear glasses
= 12% + 24%
= 36%
Percentage of pupils who do not wear glasses
= 100% - 36%
= 64%
Answer: 64%