There are some students in the bird park.
310 of them are boys, of whom 10% of them do not wear watches.
37 of the girls do not wear watches. What is the percentage of the students in the bird park who do not wear watches?
Boys |
Girls |
Total |
3x10 = 30 u |
7x10 = 70 u |
10x10 = 100 u |
No watches |
Watches |
No watches |
Watches |
|
1x3 |
9x3 |
3x10 |
4x10 |
|
3 u |
27 u |
30 u |
40 u |
100 u |
10% =
10100=
110 The number of boys is the repeated identity. Make the number of boys the same. LCM of 3 and 10 is 30.
Number of students who do not wear watches
= 3 u + 30 u
= 33 u
Total number of students
= 3 u + 27 u + 30 u + 40 u
= 100 u
Percentage of the students in the bird park who do not wear watches
=
33100 x 100%
= 33%
Answer(s): 33%