There are some students in the school hall.
110 of them are girls, of whom 70% of them do not wear watches.
29 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 |
1x10 = 10 u |
9x10 = 90 u |
10x10 = 100 u |
No watches |
Watches |
No watches |
Watches |
|
7x1 |
3x1 |
2x10 |
7x10 |
|
7 u |
3 u |
20 u |
70 u |
100 u |
70% =
70100=
710 The number of girls is the repeated identity. Make the number of girls the same. LCM of 1 and 10 is 10.
Number of students who do not wear watches
= 7 u + 20 u
= 27 u
Total number of students
= 7 u + 3 u + 20 u + 70 u
= 100 u
Percentage of the students in the school hall who do not wear watches
=
27100 x 100%
= 27%
Answer(s): 27%