There are some pupils in the school hall.
310 of them are girls, of whom 50% of them do not wear spectacles.
57 of the boys do not wear spectacles. What is the percentage of the pupils in the school hall who wear spectacles?
| Girls |
Boys |
Total |
3x2 =
6 u |
7x2 =
14 u |
10x2 =
20 u |
| No spectacles |
Spectacles |
No spectacles |
Spectacles |
|
| 1x3 |
1x3 |
5x2 |
2x2 |
|
| 3 u |
3 u |
10 u |
4 u |
20 u |
50% =
50100=
12 The number of girls is the repeated identity. Make the number of girls the same. LCM of 3 and 2 is 6.
Number of pupils who wear spectacles
= 3 u + 4 u
= 7 u
Total number of pupils
= 3 u + 3 u + 10 u + 4 u
= 20 u
Percentage of the pupils in the school hall who wear spectacles
=
720 x 100%
= 35%
Answer(s): 35%
