Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 7 : 12.
The ratio of girls to boys is 4 : 1.
The number of women to men is 7 : 3.
Let the number of children be 12 u.
- Number of adults = _____ u
- Number of girls = _____ u
- Number of men = _____ u
- Difference between the number of girls and men = _____ u
Adults |
Children |
7 u |
12 u |
Women |
Men |
Girls |
Boys |
7 |
3 |
4 |
1 |
|
310 x 7 u = 2.1 u |
45 x 12 u = 9.6 u |
|
(a)
Change ratio into units.
Number of adults = 7 u
(b)
Number of children = 12 u
Girls : Boys : Children
4 : 1 : 4 + 1
4 : 1 : 5
Fraction of the children that were girls =
45 Number of girls
=
45 x 12 u
= 9.6 u
(c)
Number of adults = 7 u
Fraction of the adults that were men =
310 Number of men
=
310 x 7 u
= 2.1 u
(d)
Difference between the number of girls and men
= 9.6 u - 2.1 u
= 7.5 u
Answer(s): (a) 7; (b) 9.6; (c) 2.1; (d) 7.5