In a school, there is a total of 120 people.
25% are adults.
The rest are children.
The number of boys and girls is in the ratio of 2 : 1.
- What percentage of the people are boys?
- How many girls are there?
Adults |
Children |
Total |
1 u |
3 u |
4 u |
|
Boys |
Girls |
|
1 u |
2 u |
1 u |
4 u |
(a)
25% =
25100 =
14 The number of children is the combined repeated identity.
Adults : Children
1 : 4 - 1
1 : 3
Percentage of the people that are boys
=
24 x 100%
= 50%
(b)
Total number of people = 4 u
4 u = 120
1 u = 120 ÷ 4 = 30
Number of girls
= 1 u
= 1 x 30
= 30
Answer(s): (a) 50%; (b) 30