There are some pupils in the zoo.
25 of them are boys, of whom 30% of them do not wear glasses.
13 of the girls do not wear glasses. What is the percentage of the pupils in the zoo who do not wear glasses?
Boys |
Girls |
Total |
2x5 = 10 u |
3x5 = 15 u |
5x5 = 25 u |
No glasses |
Glasses |
No glasses |
Glasses |
|
3x1 |
7x1 |
1x5 |
2x5 |
|
3 u |
7 u |
5 u |
10 u |
25 u |
30% =
30100=
310 The number of boys is the repeated identity. Make the number of boys the same. LCM of 2 and 10 is 10.
Number of pupils who do not wear glasses
= 3 u + 5 u
= 8 u
Total number of pupils
= 3 u + 7 u + 5 u + 10 u
= 25 u
Percentage of the pupils in the zoo who do not wear glasses
=
825 x 100%
= 32%
Answer(s): 32%