In a school, there is a total of 350 people.
40% are adults.
The rest are children.
The number of boys and girls is in the ratio of 1 : 2.
- What percentage of the people are boys?
- How many girls are there?
Adults |
Children |
Total |
2 u |
3 u |
5 u |
|
Boys |
Girls |
|
2 u |
1 u |
2 u |
5 u |
(a)
40% =
40100 =
25 The number of children is the combined repeated identity.
Adults : Children
2 : 5 - 2
2 : 3
Percentage of the people that are boys
=
15 x 100%
= 20%
(b)
Total number of people = 5 u
5 u = 350
1 u = 350 ÷ 5 = 70
Number of girls
= 2 u
= 2 x 70
= 140
Answer(s): (a) 20%; (b) 140