Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 4 : 9.
The ratio of boys to girls is 9 : 11.
The number of men to women is 1 : 4.
Let the number of children be 9 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of women = _____ u
- Difference between the number of boys and women = _____ u
Adults |
Children |
4 u |
9 u |
Men |
Women |
Boys |
Girls |
1 |
4 |
9 |
11 |
|
45 x 4 u = 3.2 u |
920 x 9 u = 4.05 u |
|
(a)
Change ratio into units.
Number of adults = 4 u
(b)
Number of children = 9 u
Boys : Girls : Children
9 : 11 : 9 + 11
9 : 11 : 20
Fraction of the children that were boys =
920 Number of boys
=
920 x 9 u
= 4.05 u
(c)
Number of adults = 4 u
Fraction of the adults that were women =
45 Number of women
=
45 x 4 u
= 3.2 u
(d)
Difference between the number of boys and women
= 4.05 u - 3.2 u
= 0.85 u
Answer(s): (a) 4; (b) 4.05; (c) 3.2; (d) 0.85