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 7 : 5.
The number of women to men is 1 : 4.
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 |
1 |
4 |
7 |
5 |
|
45 x 1 u = 0.8 u |
712 x 3 u = 1.75 u |
|
(a)
Change ratio into units.
Number of adults = 1 u
(b)
Number of children = 3 u
Boys : Girls : Children
7 : 5 : 7 + 5
7 : 5 : 12
Fraction of the children that were boys =
712 Number of boys
=
712 x 3 u
= 1.75 u
(c)
Number of adults = 1 u
Fraction of the adults that were men =
45 Number of men
=
45 x 1 u
= 0.8 u
(d)
Difference between the number of boys and men
= 1.75 u - 0.8 u
= 0.95 u
Answer(s): (a) 1; (b) 1.75; (c) 0.8; (d) 0.95