In a school, there is a total of 290 people.
30% are adults.
The rest are children.
The number of girls and boys is in the ratio of 1 : 6.
- What percentage of the people are girls?
- How many boys are there?
Adults |
Children |
Total |
3 u |
7 u |
10 u |
|
Girls |
Boys |
|
3 u |
1 u |
6 u |
10 u |
(a)
30% =
30100 =
310 The number of children is the combined repeated identity.
Adults : Children
3 : 10 - 3
3 : 7
Percentage of the people that are girls
=
110 x 100%
= 10%
(b)
Total number of people = 10 u
10 u = 290
1 u = 290 ÷ 10 = 29
Number of boys
= 6 u
= 6 x 29
= 174
Answer(s): (a) 10%; (b) 174