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 3 : 7.
The number of women to men is 1 : 3.
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 |
3 |
3 |
7 |
|
34 x 1 u = 0.75 u |
310 x 3 u = 0.9 u |
|
(a)
Change ratio into units.
Number of adults = 1 u
(b)
Number of children = 3 u
Boys : Girls : Children
3 : 7 : 3 + 7
3 : 7 : 10
Fraction of the children that were boys =
310 Number of boys
=
310 x 3 u
= 0.9 u
(c)
Number of adults = 1 u
Fraction of the adults that were men =
34 Number of men
=
34 x 1 u
= 0.75 u
(d)
Difference between the number of boys and men
= 0.9 u - 0.75 u
= 0.15 u
Answer(s): (a) 1; (b) 0.9; (c) 0.75; (d) 0.15