Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 7 : 9.
The ratio of girls to boys is 1 : 1.
The number of men to women is 2 : 3.
Let the number of children be 9 u.
- Number of adults = _____ u
- Number of girls = _____ u
- Number of women = _____ u
- Difference between the number of girls and women = _____ u
Adults |
Children |
7 u |
9 u |
Men |
Women |
Girls |
Boys |
2 |
3 |
1 |
1 |
|
35 x 7 u = 4.2 u |
12 x 9 u = 4.5 u |
|
(a)
Change ratio into units.
Number of adults = 7 u
(b)
Number of children = 9 u
Girls : Boys : Children
1 : 1 : 1 + 1
1 : 1 : 2
Fraction of the children that were girls =
12 Number of girls
=
12 x 9 u
= 4.5 u
(c)
Number of adults = 7 u
Fraction of the adults that were women =
35 Number of women
=
35 x 7 u
= 4.2 u
(d)
Difference between the number of girls and women
= 4.5 u - 4.2 u
= 0.3 u
Answer(s): (a) 7; (b) 4.5; (c) 4.2; (d) 0.3