30% of the pupils are boys. 40% of the boys and 70% of the girls wear caps. What percentage of the pupils do not wear caps?
Boys |
Girls |
Total |
30% |
70% |
100% |
Wear caps |
Do not wear |
Wear caps |
Do not wear |
|
12% |
18% |
49% |
21% |
100% |
Number of boys who wear caps
= 40% x 30%
=
40100 x 30%
= 12%
Number of girls who wear caps
= 70% x 70%
=
70100 x 70%
= 49%
Percentage of pupils who wear caps
= 12% + 49%
= 61%
Percentage of pupils who do not wear caps
= 100% - 61%
= 39%
Answer: 39%