70% of the pupils are girls. 40% of the girls and 70% of the boys wear hats. What percentage of the pupils do not wear hats?
Girls |
Boys |
Total |
70% |
30% |
100% |
Wear hats |
Do not wear |
Wear hats |
Do not wear |
|
28% |
42% |
21% |
9% |
100% |
Number of girls who wear hats
= 40% x 70%
=
40100 x 70%
= 28%
Number of boys who wear hats
= 70% x 30%
=
70100 x 30%
= 21%
Percentage of pupils who wear hats
= 28% + 21%
= 49%
Percentage of pupils who do not wear hats
= 100% - 49%
= 51%
Answer: 51%