There are some pupils in the stadium.
25 of them are girls, of whom 40% of them do not wear glasses.
13 of the boys do not wear glasses. What is the percentage of the pupils in the stadium who do not wear glasses?
Girls |
Boys |
Total |
2x5 = 10 u |
3x5 = 15 u |
5x5 = 25 u |
No glasses |
Glasses |
No glasses |
Glasses |
|
2x2 |
3x2 |
1x5 |
2x5 |
|
4 u |
6 u |
5 u |
10 u |
25 u |
40% =
40100=
25 The number of girls is the repeated identity. Make the number of girls the same. LCM of 2 and 5 is 10.
Number of pupils who do not wear glasses
= 4 u + 5 u
= 9 u
Total number of pupils
= 4 u + 6 u + 5 u + 10 u
= 25 u
Percentage of the pupils in the stadium who do not wear glasses
=
925 x 100%
= 36%
Answer(s): 36%