90% of the pupils are boys. 60% of the boys and 70% 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 |
|
54% |
36% |
7% |
3% |
100% |
Number of boys who wear hats
= 60% x 90%
=
60100 x 90%
= 54%
Number of girls who wear hats
= 70% x 10%
=
70100 x 10%
= 7%
Percentage of pupils who wear hats
= 54% + 7%
= 61%
Percentage of pupils who do not wear hats
= 100% - 61%
= 39%
Answer: 39%