90% of the students are boys. 30% of the boys and 40% of the girls wear hats. What percentage of the students do not wear hats?
| Boys |
Girls |
Total |
| 90% |
10% |
100% |
| Wear hats |
Do not wear |
Wear hats |
Do not wear |
|
| 27% |
63% |
4% |
6% |
100% |
Number of boys who wear hats
= 30% x 90%
=
30100 x 90%
= 27%
Number of girls who wear hats
= 40% x 10%
=
40100 x 10%
= 4%
Percentage of students who wear hats
= 27% + 4%
= 31%
Percentage of students who do not wear hats
= 100% - 31%
= 69%
Answer: 69%
