There are some pupils in the school hall.
710 of them are boys, of whom 10% of them do not wear caps.
23 of the girls do not wear caps. What is the percentage of the pupils in the school hall who do not wear caps?
Boys |
Girls |
Total |
7x10 = 70 u |
3x10 = 30 u |
10x10 = 100 u |
No caps |
Caps |
No caps |
Caps |
|
1x7 |
9x7 |
2x10 |
1x10 |
|
7 u |
63 u |
20 u |
10 u |
100 u |
10% =
10100=
110 The number of boys is the repeated identity. Make the number of boys the same. LCM of 7 and 10 is 70.
Number of pupils who do not wear caps
= 7 u + 20 u
= 27 u
Total number of pupils
= 7 u + 63 u + 20 u + 10 u
= 100 u
Percentage of the pupils in the school hall who do not wear caps
=
27100 x 100%
= 27%
Answer(s): 27%