There are some students in the school hall.
110 of them are boys, of whom 50% of them do not wear watches.
59 of the girls do not wear watches. What is the percentage of the students in the school hall who wear watches?
| Boys |
Girls |
Total |
1x2 =
2 u |
9x2 =
18 u |
10x2 =
20 u |
| No watches |
Watches |
No watches |
Watches |
|
| 1x1 |
1x1 |
5x2 |
4x2 |
|
| 1 u |
1 u |
10 u |
8 u |
20 u |
50% =
50100=
12 The number of boys is the repeated identity. Make the number of boys the same. LCM of 1 and 2 is 2.
Number of students who wear watches
= 1 u + 8 u
= 9 u
Total number of students
= 1 u + 1 u + 10 u + 8 u
= 20 u
Percentage of the students in the school hall who wear watches
=
920 x 100%
= 45%
Answer(s): 45%
