Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 2 : 9.
The ratio of boys to girls is 1 : 1.
The number of women to men is 1 : 4.
Let the number of children be 9 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Difference between the number of boys and men = _____ u
Adults |
Children |
2 u |
9 u |
Women |
Men |
Boys |
Girls |
1 |
4 |
1 |
1 |
|
45 x 2 u = 1.6 u |
12 x 9 u = 4.5 u |
|
(a)
Change ratio into units.
Number of adults = 2 u
(b)
Number of children = 9 u
Boys : Girls : Children
1 : 1 : 1 + 1
1 : 1 : 2
Fraction of the children that were boys =
12 Number of boys
=
12 x 9 u
= 4.5 u
(c)
Number of adults = 2 u
Fraction of the adults that were men =
45 Number of men
=
45 x 2 u
= 1.6 u
(d)
Difference between the number of boys and men
= 4.5 u - 1.6 u
= 2.9 u
Answer(s): (a) 2; (b) 4.5; (c) 1.6; (d) 2.9