There are some pupils in the school hall.
710 of them are girls, of whom 80% of them do not wear glasses.
13 of the boys do not wear glasses. What is the percentage of the pupils in the school hall who wear glasses?
Girls |
Boys |
Total |
7x5 = 35 u |
3x5 = 15 u |
10x5 = 50 u |
No glasses |
Glasses |
No glasses |
Glasses |
|
4x7 |
1x7 |
1x5 |
2x5 |
|
28 u |
7 u |
5 u |
10 u |
50 u |
80% =
80100=
45 The number of girls is the repeated identity. Make the number of girls the same. LCM of 7 and 5 is 35.
Number of pupils who wear glasses
= 7 u + 10 u
= 17 u
Total number of pupils
= 28 u + 7 u + 5 u + 10 u
= 50 u
Percentage of the pupils in the school hall who wear glasses
=
1750 x 100%
= 34%
Answer(s): 34%