There are some pupils in the bird park.
110 of them are boys, of whom 10% of them do not wear glasses.
49 of the girls do not wear glasses. What is the percentage of the pupils in the bird park who wear glasses?
| Boys |
Girls |
Total |
1x10 =
10 u |
9x10 =
90 u |
10x10 =
100 u |
| No glasses |
Glasses |
No glasses |
Glasses |
|
| 1x1 |
9x1 |
4x10 |
5x10 |
|
| 1 u |
9 u |
40 u |
50 u |
100 u |
10% =
10100=
110 The number of boys is the repeated identity. Make the number of boys the same. LCM of 1 and 10 is 10.
Number of pupils who wear glasses
= 9 u + 50 u
= 59 u
Total number of pupils
= 1 u + 9 u + 40 u + 50 u
= 100 u
Percentage of the pupils in the bird park who wear glasses
=
59100 x 100%
= 59%
Answer(s): 59%
