20% of the students are boys. 40% of the boys and 80% of the girls wear watches. What percentage of the students do not wear watches?
Boys |
Girls |
Total |
20% |
80% |
100% |
Wear watches |
Do not wear |
Wear watches |
Do not wear |
|
8% |
12% |
64% |
16% |
100% |
Number of boys who wear watches
= 40% x 20%
=
40100 x 20%
= 8%
Number of girls who wear watches
= 80% x 80%
=
80100 x 80%
= 64%
Percentage of students who wear watches
= 8% + 64%
= 72%
Percentage of students who do not wear watches
= 100% - 72%
= 28%
Answer: 28%