In a school, there is a total of 340 people.
25% are adults.
The rest are children.
The number of girls and boys is in the ratio of 1 : 2.
- What percentage of the people are girls?
- How many boys are there?
Adults |
Children |
Total |
1 u |
3 u |
4 u |
|
Girls |
Boys |
|
1 u |
1 u |
2 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 girls
=
14 x 100%
= 25%
(b)
Total number of people = 4 u
4 u = 340
1 u = 340 ÷ 4 = 85
Number of boys
= 2 u
= 2 x 85
= 170
Answer(s): (a) 25%; (b) 170