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