Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 1 : 3.
The ratio of girls to boys is 5 : 7.
The number of men to women is 4 : 1.
Let the number of children be 3 u.
- Number of adults = _____ u
- Number of girls = _____ u
- Number of women = _____ u
- Difference between the number of girls and women = _____ u
Adults |
Children |
1 u |
3 u |
Men |
Women |
Girls |
Boys |
4 |
1 |
5 |
7 |
|
15 x 1 u = 0.2 u |
512 x 3 u = 1.25 u |
|
(a)
Change ratio into units.
Number of adults = 1 u
(b)
Number of children = 3 u
Girls : Boys : Children
5 : 7 : 5 + 7
5 : 7 : 12
Fraction of the children that were girls =
512 Number of girls
=
512 x 3 u
= 1.25 u
(c)
Number of adults = 1 u
Fraction of the adults that were women =
15 Number of women
=
15 x 1 u
= 0.2 u
(d)
Difference between the number of girls and women
= 1.25 u - 0.2 u
= 1.05 u
Answer(s): (a) 1; (b) 1.25; (c) 0.2; (d) 1.05