40% of the students are girls. 30% of the girls and 70% 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% |
42% |
18% |
100% |
Number of girls who wear watches
= 30% x 40%
=
30100 x 40%
= 12%
Number of boys who wear watches
= 70% x 60%
=
70100 x 60%
= 42%
Percentage of students who wear watches
= 12% + 42%
= 54%
Percentage of students who do not wear watches
= 100% - 54%
= 46%
Answer: 46%