There are some pupils in the stadium.
110 of them are girls, of whom 20% of them do not wear glasses.
49 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 |
1x5 =
5 u |
9x5 =
45 u |
10x5 =
50 u |
| No glasses |
Glasses |
No glasses |
Glasses |
|
| 1x1 |
4x1 |
4x5 |
5x5 |
|
| 1 u |
4 u |
20 u |
25 u |
50 u |
20% =
20100=
15 The number of girls is the repeated identity. Make the number of girls the same. LCM of 1 and 5 is 5.
Number of pupils who do not wear glasses
= 1 u + 20 u
= 21 u
Total number of pupils
= 1 u + 4 u + 20 u + 25 u
= 50 u
Percentage of the pupils in the stadium who do not wear glasses
=
2150 x 100%
= 42%
Answer(s): 42%
