Fill in the blanks in whole numbers or fractions.
The ratio of adults to children is 7 : 8.
The ratio of girls to boys is 2 : 3.
The number of women to men is 3 : 2.
Let the number of children be 8 u.
- Number of adults = _____ u
- Number of girls = _____ u
- Number of men = _____ u
- Total number of people = _____ u
Adults |
Children |
7 u |
8 u |
Women |
Men |
Girls |
Boys |
3 |
2 |
2 |
3 |
|
25 x 7 u = 245 u |
25 x 8 u = 315 u |
|
(a)
Change ratio into units.
Girls : Boys : Children
2 : 3 : 2 + 3
2 : 3 : 5
Number of adults = 7 u
(b)
Number of children = 8 u
Fraction of the children that were girls =
25 Number of girls
=
25 x 8 u
= 3
15 u
(c)
Number of adults = 7 u
Fraction of the adults that were men =
25 Number of men
=
25 x 7 u
= 2
45 u
(d)
Total number of people
= 7 u + 8 u
= 15 u
Answer(s): (a) 7; (b) 3
15; (c) 2
45; (d) 15