There are some pupils in the stadium.
710 of them are girls, of whom 50% of them do not wear glasses.
23 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 |
7x2 =
14 u |
3x2 =
6 u |
10x2 =
20 u |
| No glasses |
Glasses |
No glasses |
Glasses |
|
| 1x7 |
1x7 |
2x2 |
1x2 |
|
| 7 u |
7 u |
4 u |
2 u |
20 u |
50% =
50100=
12 The number of girls is the repeated identity. Make the number of girls the same. LCM of 7 and 2 is 14.
Number of pupils who do not wear glasses
= 7 u + 4 u
= 11 u
Total number of pupils
= 7 u + 7 u + 4 u + 2 u
= 20 u
Percentage of the pupils in the stadium who do not wear glasses
=
1120 x 100%
= 55%
Answer(s): 55%
