90% of the pupils are girls. 50% of the girls and 60% of the boys wear hats. What percentage of the pupils do not wear hats?
| Girls |
Boys |
Total |
| 90% |
10% |
100% |
| Wear hats |
Do not wear |
Wear hats |
Do not wear |
|
| 45% |
45% |
6% |
4% |
100% |
Number of girls who wear hats
= 50% x 90%
=
50100 x 90%
= 45%
Number of boys who wear hats
= 60% x 10%
=
60100 x 10%
= 6%
Percentage of pupils who wear hats
= 45% + 6%
= 51%
Percentage of pupils who do not wear hats
= 100% - 51%
= 49%
Answer: 49%
