There are some pupils in the bird park.
310 of them are boys, of whom 40% of them do not wear caps.
17 of the girls do not wear caps. What is the percentage of the pupils in the bird park who do not wear caps?
Boys |
Girls |
Total |
3x5 = 15 u |
7x5 = 35 u |
10x5 = 50 u |
No caps |
Caps |
No caps |
Caps |
|
2x3 |
3x3 |
1x5 |
6x5 |
|
6 u |
9 u |
5 u |
30 u |
50 u |
40% =
40100=
25 The number of boys is the repeated identity. Make the number of boys the same. LCM of 3 and 5 is 15.
Number of pupils who do not wear caps
= 6 u + 5 u
= 11 u
Total number of pupils
= 6 u + 9 u + 5 u + 30 u
= 50 u
Percentage of the pupils in the bird park who do not wear caps
=
1150 x 100%
= 22%
Answer(s): 22%