Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 5 : 7.
The ratio of boys to girls is 3 : 7.
The number of women to men is 3 : 1.
Let the number of children be 7 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Difference between the number of boys and men = _____ u
Adults |
Children |
5 u |
7 u |
Women |
Men |
Boys |
Girls |
3 |
1 |
3 |
7 |
|
14 x 5 u = 1.25 u |
310 x 7 u = 2.1 u |
|
(a)
Change ratio into units.
Number of adults = 5 u
(b)
Number of children = 7 u
Boys : Girls : Children
3 : 7 : 3 + 7
3 : 7 : 10
Fraction of the children that were boys =
310 Number of boys
=
310 x 7 u
= 2.1 u
(c)
Number of adults = 5 u
Fraction of the adults that were men =
14 Number of men
=
14 x 5 u
= 1.25 u
(d)
Difference between the number of boys and men
= 2.1 u - 1.25 u
= 0.85 u
Answer(s): (a) 5; (b) 2.1; (c) 1.25; (d) 0.85