70% of the students are boys. 30% of the boys and 70% of the girls wear watches. What percentage of the students do not wear watches?
| Boys |
Girls |
Total |
| 70% |
30% |
100% |
| Wear watches |
Do not wear |
Wear watches |
Do not wear |
|
| 21% |
49% |
21% |
9% |
100% |
Number of boys who wear watches
= 30% x 70%
=
30100 x 70%
= 21%
Number of girls who wear watches
= 70% x 30%
=
70100 x 30%
= 21%
Percentage of students who wear watches
= 21% + 21%
= 42%
Percentage of students who do not wear watches
= 100% - 42%
= 58%
Answer: 58%
