Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 1 : 1.
The ratio of boys to girls is 9 : 11.
The number of women to men is 3 : 1.
Let the number of children be 1 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Difference between the number of boys and men = _____ u
Adults |
Children |
1 u |
1 u |
Women |
Men |
Boys |
Girls |
3 |
1 |
9 |
11 |
|
14 x 1 u = 0.25 u |
920 x 1 u = 0.45 u |
|
(a)
Change ratio into units.
Number of adults = 1 u
(b)
Number of children = 1 u
Boys : Girls : Children
9 : 11 : 9 + 11
9 : 11 : 20
Fraction of the children that were boys =
920 Number of boys
=
920 x 1 u
= 0.45 u
(c)
Number of adults = 1 u
Fraction of the adults that were men =
14 Number of men
=
14 x 1 u
= 0.25 u
(d)
Difference between the number of boys and men
= 0.45 u - 0.25 u
= 0.2 u
Answer(s): (a) 1; (b) 0.45; (c) 0.25; (d) 0.2