There are some students in the school hall.
25 of them are girls, of whom 75% of them do not wear watches.
13 of the boys do not wear watches. What is the percentage of the students in the school hall who do not wear watches?
| Girls |
Boys |
Total |
2x2 =
4 u |
3x2 =
6 u |
5x2 =
10 u |
| No watches |
Watches |
No watches |
Watches |
|
| 3x1 |
1x1 |
1x2 |
2x2 |
|
| 3 u |
1 u |
2 u |
4 u |
10 u |
75% =
75100=
34 The number of girls is the repeated identity. Make the number of girls the same. LCM of 2 and 4 is 4.
Number of students who do not wear watches
= 3 u + 2 u
= 5 u
Total number of students
= 3 u + 1 u + 2 u + 4 u
= 10 u
Percentage of the students in the school hall who do not wear watches
=
510 x 100%
= 50%
Answer(s): 50%
