30% of the pupils are girls. 40% of the girls and 60% of the boys wear watches. What percentage of the pupils do not wear watches?
| Girls |
Boys |
Total |
| 30% |
70% |
100% |
| Wear watches |
Do not wear |
Wear watches |
Do not wear |
|
| 12% |
18% |
42% |
28% |
100% |
Number of girls who wear watches
= 40% x 30%
=
40100 x 30%
= 12%
Number of boys who wear watches
= 60% x 70%
=
60100 x 70%
= 42%
Percentage of pupils who wear watches
= 12% + 42%
= 54%
Percentage of pupils who do not wear watches
= 100% - 54%
= 46%
Answer: 46%
