Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 2 : 7.
The ratio of girls to boys is 1 : 4.
The number of women to men is 4 : 1.
Let the number of children be 7 u.
- Number of adults = _____ u
- Number of girls = _____ u
- Number of men = _____ u
- Difference between the number of girls and men = _____ u
Adults |
Children |
2 u |
7 u |
Women |
Men |
Girls |
Boys |
4 |
1 |
1 |
4 |
|
15 x 2 u = 0.4 u |
15 x 7 u = 1.4 u |
|
(a)
Change ratio into units.
Number of adults = 2 u
(b)
Number of children = 7 u
Girls : Boys : Children
1 : 4 : 1 + 4
1 : 4 : 5
Fraction of the children that were girls =
15 Number of girls
=
15 x 7 u
= 1.4 u
(c)
Number of adults = 2 u
Fraction of the adults that were men =
15 Number of men
=
15 x 2 u
= 0.4 u
(d)
Difference between the number of girls and men
= 1.4 u - 0.4 u
= 1 u
Answer(s): (a) 2; (b) 1.4; (c) 0.4; (d) 1