60% of the pupils are girls. 30% of the girls and 40% of the boys wear watches. What percentage of the pupils do not wear watches?
Girls |
Boys |
Total |
60% |
40% |
100% |
Wear watches |
Do not wear |
Wear watches |
Do not wear |
|
18% |
42% |
16% |
24% |
100% |
Number of girls who wear watches
= 30% x 60%
=
30100 x 60%
= 18%
Number of boys who wear watches
= 40% x 40%
=
40100 x 40%
= 16%
Percentage of pupils who wear watches
= 18% + 16%
= 34%
Percentage of pupils who do not wear watches
= 100% - 34%
= 66%
Answer: 66%