Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 3 : 10.
The ratio of boys to girls is 1 : 3.
The number of women to men is 1 : 2.
Let the number of children be 10 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Difference between the number of boys and men = _____ u
Adults |
Children |
3 u |
10 u |
Women |
Men |
Boys |
Girls |
1 |
2 |
1 |
3 |
|
23 x 3 u = 2 u |
14 x 10 u = 2.5 u |
|
(a)
Change ratio into units.
Number of adults = 3 u
(b)
Number of children = 10 u
Boys : Girls : Children
1 : 3 : 1 + 3
1 : 3 : 4
Fraction of the children that were boys =
14 Number of boys
=
14 x 10 u
= 2.5 u
(c)
Number of adults = 3 u
Fraction of the adults that were men =
23 Number of men
=
23 x 3 u
= 2 u
(d)
Difference between the number of boys and men
= 2.5 u - 2 u
= 0.5 u
Answer(s): (a) 3; (b) 2.5; (c) 2; (d) 0.5