There are some pupils in the bird park.
15 of them are boys, of whom 60% of them do not wear glasses.
14 of the girls do not wear glasses. What is the percentage of the pupils in the bird park who do not wear glasses?
Boys |
Girls |
Total |
1x5 = 5 u |
4x5 = 20 u |
5x5 = 25 u |
No glasses |
Glasses |
No glasses |
Glasses |
|
3x1 |
2x1 |
1x5 |
3x5 |
|
3 u |
2 u |
5 u |
15 u |
25 u |
60% =
60100=
35 The number of boys is the repeated identity. Make the number of boys the same. LCM of 1 and 5 is 5.
Number of pupils who do not wear glasses
= 3 u + 5 u
= 8 u
Total number of pupils
= 3 u + 2 u + 5 u + 15 u
= 25 u
Percentage of the pupils in the bird park who do not wear glasses
=
825 x 100%
= 32%
Answer(s): 32%