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 7 : 3.
The number of women to men is 2 : 3.
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 |
2 |
3 |
7 |
3 |
|
35 x 2 u = 1.2 u |
710 x 9 u = 6.3 u |
|
(a)
Change ratio into units.
Number of adults = 2 u
(b)
Number of children = 9 u
Boys : Girls : Children
7 : 3 : 7 + 3
7 : 3 : 10
Fraction of the children that were boys =
710 Number of boys
=
710 x 9 u
= 6.3 u
(c)
Number of adults = 2 u
Fraction of the adults that were men =
35 Number of men
=
35 x 2 u
= 1.2 u
(d)
Difference between the number of boys and men
= 6.3 u - 1.2 u
= 5.1 u
Answer(s): (a) 2; (b) 6.3; (c) 1.2; (d) 5.1