Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 4 : 9.
The ratio of girls to boys is 7 : 8.
The number of women to men is 9 : 11.
Let the number of children be 9 u.
- Number of adults = _____ u
- Number of girls = _____ u
- Number of men = _____ u
- Difference between the number of girls and men = _____ u
Adults |
Children |
4 u |
9 u |
Women |
Men |
Girls |
Boys |
9 |
11 |
7 |
8 |
|
1120 x 4 u = 2.2 u |
715 x 9 u = 4.2 u |
|
(a)
Change ratio into units.
Number of adults = 4 u
(b)
Number of children = 9 u
Girls : Boys : Children
7 : 8 : 7 + 8
7 : 8 : 15
Fraction of the children that were girls =
715 Number of girls
=
715 x 9 u
= 4.2 u
(c)
Number of adults = 4 u
Fraction of the adults that were men =
1120 Number of men
=
1120 x 4 u
= 2.2 u
(d)
Difference between the number of girls and men
= 4.2 u - 2.2 u
= 2 u
Answer(s): (a) 4; (b) 4.2; (c) 2.2; (d) 2