Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 8 : 9.
The ratio of boys to girls is 3 : 1.
The number of women to men is 7 : 3.
Let the number of children be 9 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Difference between the number of boys and men = _____ u
Adults |
Children |
8 u |
9 u |
Women |
Men |
Boys |
Girls |
7 |
3 |
3 |
1 |
|
310 x 8 u = 2.4 u |
34 x 9 u = 6.75 u |
|
(a)
Change ratio into units.
Number of adults = 8 u
(b)
Number of children = 9 u
Boys : Girls : Children
3 : 1 : 3 + 1
3 : 1 : 4
Fraction of the children that were boys =
34 Number of boys
=
34 x 9 u
= 6.75 u
(c)
Number of adults = 8 u
Fraction of the adults that were men =
310 Number of men
=
310 x 8 u
= 2.4 u
(d)
Difference between the number of boys and men
= 6.75 u - 2.4 u
= 4.35 u
Answer(s): (a) 8; (b) 6.75; (c) 2.4; (d) 4.35