Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 3 : 8.
The ratio of girls to boys is 9 : 11.
The number of women to men is 7 : 8.
Let the number of children be 8 u.
- Number of adults = _____ u
- Number of girls = _____ u
- Number of men = _____ u
- Difference between the number of girls and men = _____ u
Adults |
Children |
3 u |
8 u |
Women |
Men |
Girls |
Boys |
7 |
8 |
9 |
11 |
|
815 x 3 u = 1.6 u |
920 x 8 u = 3.6 u |
|
(a)
Change ratio into units.
Number of adults = 3 u
(b)
Number of children = 8 u
Girls : Boys : Children
9 : 11 : 9 + 11
9 : 11 : 20
Fraction of the children that were girls =
920 Number of girls
=
920 x 8 u
= 3.6 u
(c)
Number of adults = 3 u
Fraction of the adults that were men =
815 Number of men
=
815 x 3 u
= 1.6 u
(d)
Difference between the number of girls and men
= 3.6 u - 1.6 u
= 2 u
Answer(s): (a) 3; (b) 3.6; (c) 1.6; (d) 2