There are some pupils in the zoo.
310 of them are boys, of whom 80% of them do not wear caps.
17 of the girls do not wear caps. What is the percentage of the pupils in the zoo who wear caps?
Boys |
Girls |
Total |
3x5 = 15 u |
7x5 = 35 u |
10x5 = 50 u |
No caps |
Caps |
No caps |
Caps |
|
4x3 |
1x3 |
1x5 |
6x5 |
|
12 u |
3 u |
5 u |
30 u |
50 u |
80% =
80100=
45 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 wear caps
= 3 u + 30 u
= 33 u
Total number of pupils
= 12 u + 3 u + 5 u + 30 u
= 50 u
Percentage of the pupils in the zoo who wear caps
=
3350 x 100%
= 66%
Answer(s): 66%