20% of the students are girls. 50% of the girls and 60% of the boys wear watches. What percentage of the students do not wear watches?
| Girls |
Boys |
Total |
| 20% |
80% |
100% |
| Wear watches |
Do not wear |
Wear watches |
Do not wear |
|
| 10% |
10% |
48% |
32% |
100% |
Number of girls who wear watches
= 50% x 20%
=
50100 x 20%
= 10%
Number of boys who wear watches
= 60% x 80%
=
60100 x 80%
= 48%
Percentage of students who wear watches
= 10% + 48%
= 58%
Percentage of students who do not wear watches
= 100% - 58%
= 42%
Answer: 42%
