70% of the students are boys. 40% of the boys and 50% 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 |
|
28% |
42% |
15% |
15% |
100% |
Number of boys who wear watches
= 40% x 70%
=
40100 x 70%
= 28%
Number of girls who wear watches
= 50% x 30%
=
50100 x 30%
= 15%
Percentage of students who wear watches
= 28% + 15%
= 43%
Percentage of students who do not wear watches
= 100% - 43%
= 57%
Answer: 57%