Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 3 : 8.
The ratio of boys to girls is 1 : 4.
The number of women to men is 3 : 2.
Let the number of children be 8 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Difference between the number of boys and men = _____ u
Adults |
Children |
3 u |
8 u |
Women |
Men |
Boys |
Girls |
3 |
2 |
1 |
4 |
|
25 x 3 u = 1.2 u |
15 x 8 u = 1.6 u |
|
(a)
Change ratio into units.
Number of adults = 3 u
(b)
Number of children = 8 u
Boys : Girls : Children
1 : 4 : 1 + 4
1 : 4 : 5
Fraction of the children that were boys =
15 Number of boys
=
15 x 8 u
= 1.6 u
(c)
Number of adults = 3 u
Fraction of the adults that were men =
25 Number of men
=
25 x 3 u
= 1.2 u
(d)
Difference between the number of boys and men
= 1.6 u - 1.2 u
= 0.4 u
Answer(s): (a) 3; (b) 1.6; (c) 1.2; (d) 0.4