90% of the pupils are boys. 30% of the boys and 50% of the girls wear hats. What percentage of the pupils do not wear hats?
| Boys |
Girls |
Total |
| 90% |
10% |
100% |
| Wear hats |
Do not wear |
Wear hats |
Do not wear |
|
| 27% |
63% |
5% |
5% |
100% |
Number of boys who wear hats
= 30% x 90%
=
30100 x 90%
= 27%
Number of girls who wear hats
= 50% x 10%
=
50100 x 10%
= 5%
Percentage of pupils who wear hats
= 27% + 5%
= 32%
Percentage of pupils who do not wear hats
= 100% - 32%
= 68%
Answer: 68%
