40% of the students are girls. 30% of the girls and 80% of the boys wear watches. What percentage of the students do not wear watches?
Girls |
Boys |
Total |
40% |
60% |
100% |
Wear watches |
Do not wear |
Wear watches |
Do not wear |
|
12% |
28% |
48% |
12% |
100% |
Number of girls who wear watches
= 30% x 40%
=
30100 x 40%
= 12%
Number of boys who wear watches
= 80% x 60%
=
80100 x 60%
= 48%
Percentage of students who wear watches
= 12% + 48%
= 60%
Percentage of students who do not wear watches
= 100% - 60%
= 40%
Answer: 40%