There are some students in the bird park.
15 of them are girls, of whom 20% of them do not wear glasses.
14 of the boys do not wear glasses. What is the percentage of the students in the bird park who do not wear glasses?
Girls |
Boys |
Total |
1x5 = 5 u |
4x5 = 20 u |
5x5 = 25 u |
No glasses |
Glasses |
No glasses |
Glasses |
|
1x1 |
4x1 |
1x5 |
3x5 |
|
1 u |
4 u |
5 u |
15 u |
25 u |
20% =
20100=
15 The number of girls is the repeated identity. Make the number of girls the same. LCM of 1 and 5 is 5.
Number of students who do not wear glasses
= 1 u + 5 u
= 6 u
Total number of students
= 1 u + 4 u + 5 u + 15 u
= 25 u
Percentage of the students in the bird park who do not wear glasses
=
625 x 100%
= 24%
Answer(s): 24%