There are some pupils in the bird park.
35 of them are boys, of whom 70% of them do not wear spectacles.
12 of the girls do not wear spectacles. What is the percentage of the pupils in the bird park who wear spectacles?
| Boys |
Girls |
Total |
3x10 =
30 u |
2x10 =
20 u |
5x10 =
50 u |
| No spectacles |
Spectacles |
No spectacles |
Spectacles |
|
| 7x3 |
3x3 |
1x10 |
1x10 |
|
| 21 u |
9 u |
10 u |
10 u |
50 u |
70% =
70100=
710 The number of boys is the repeated identity. Make the number of boys the same. LCM of 3 and 10 is 30.
Number of pupils who wear spectacles
= 9 u + 10 u
= 19 u
Total number of pupils
= 21 u + 9 u + 10 u + 10 u
= 50 u
Percentage of the pupils in the bird park who wear spectacles
=
1950 x 100%
= 38%
Answer(s): 38%
