There are some pupils in the bird park.
310 of them are girls, of whom 60% of them do not wear glasses.
47 of the boys do not wear glasses. What is the percentage of the pupils in the bird park who do not wear glasses?
Girls |
Boys |
Total |
3x5 = 15 u |
7x5 = 35 u |
10x5 = 50 u |
No glasses |
Glasses |
No glasses |
Glasses |
|
3x3 |
2x3 |
4x5 |
3x5 |
|
9 u |
6 u |
20 u |
15 u |
50 u |
60% =
60100=
35 The number of girls is the repeated identity. Make the number of girls the same. LCM of 3 and 5 is 15.
Number of pupils who do not wear glasses
= 9 u + 20 u
= 29 u
Total number of pupils
= 9 u + 6 u + 20 u + 15 u
= 50 u
Percentage of the pupils in the bird park who do not wear glasses
=
2950 x 100%
= 58%
Answer(s): 58%