Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 1 : 3.
The ratio of boys to girls is 9 : 11.
The number of women to men is 3 : 7.
Let the number of children be 3 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 |
3 u |
Women |
Men |
Boys |
Girls |
3 |
7 |
9 |
11 |
|
710 x 1 u = 0.7 u |
920 x 3 u = 1.35 u |
|
(a)
Change ratio into units.
Number of adults = 1 u
(b)
Number of children = 3 u
Boys : Girls : Children
9 : 11 : 9 + 11
9 : 11 : 20
Fraction of the children that were boys =
920 Number of boys
=
920 x 3 u
= 1.35 u
(c)
Number of adults = 1 u
Fraction of the adults that were men =
710 Number of men
=
710 x 1 u
= 0.7 u
(d)
Difference between the number of boys and men
= 1.35 u - 0.7 u
= 0.65 u
Answer(s): (a) 1; (b) 1.35; (c) 0.7; (d) 0.65