50% of the students are boys. 30% of the boys and 70% of the girls wear watches. What percentage of the students do not wear watches?
Boys |
Girls |
Total |
50% |
50% |
100% |
Wear watches |
Do not wear |
Wear watches |
Do not wear |
|
15% |
35% |
35% |
15% |
100% |
Number of boys who wear watches
= 30% x 50%
=
30100 x 50%
= 15%
Number of girls who wear watches
= 70% x 50%
=
70100 x 50%
= 35%
Percentage of students who wear watches
= 15% + 35%
= 50%
Percentage of students who do not wear watches
= 100% - 50%
= 50%
Answer: 50%