90% of the pupils are girls. 40% of the girls and 70% of the boys wear glasses. What percentage of the pupils do not wear glasses?
| Girls |
Boys |
Total |
| 90% |
10% |
100% |
| Wear glasses |
Do not wear |
Wear glasses |
Do not wear |
|
| 36% |
54% |
7% |
3% |
100% |
Number of girls who wear glasses
= 40% x 90%
=
40100 x 90%
= 36%
Number of boys who wear glasses
= 70% x 10%
=
70100 x 10%
= 7%
Percentage of pupils who wear glasses
= 36% + 7%
= 43%
Percentage of pupils who do not wear glasses
= 100% - 43%
= 57%
Answer: 57%
