There are some students in the school hall.
310 of them are boys, of whom 80% of them do not wear spectacles.
57 of the girls do not wear spectacles. What is the percentage of the students in the school hall who do not wear spectacles?
Boys |
Girls |
Total |
3x5 = 15 u |
7x5 = 35 u |
10x5 = 50 u |
No spectacles |
Spectacles |
No spectacles |
Spectacles |
|
4x3 |
1x3 |
5x5 |
2x5 |
|
12 u |
3 u |
25 u |
10 u |
50 u |
80% =
80100=
45 The number of boys is the repeated identity. Make the number of boys the same. LCM of 3 and 5 is 15.
Number of students who do not wear spectacles
= 12 u + 25 u
= 37 u
Total number of students
= 12 u + 3 u + 25 u + 10 u
= 50 u
Percentage of the students in the school hall who do not wear spectacles
=
3750 x 100%
= 74%
Answer(s): 74%