There are some pupils in the stadium.
310 of them are boys, of whom 70% of them do not wear spectacles.
47 of the girls do not wear spectacles. What is the percentage of the pupils in the stadium who do not wear spectacles?
Boys |
Girls |
Total |
3x10 = 30 u |
7x10 = 70 u |
10x10 = 100 u |
No spectacles |
Spectacles |
No spectacles |
Spectacles |
|
7x3 |
3x3 |
4x10 |
3x10 |
|
21 u |
9 u |
40 u |
30 u |
100 u |
70% =
70100=
710 The number of boys is the repeated identity. Make the number of boys the same. LCM of 3 and 10 is 30.
Number of pupils who do not wear spectacles
= 21 u + 40 u
= 61 u
Total number of pupils
= 21 u + 9 u + 40 u + 30 u
= 100 u
Percentage of the pupils in the stadium who do not wear spectacles
=
61100 x 100%
= 61%
Answer(s): 61%