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 1 : 1.
The number of men to women is 9 : 11.
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 |
9 |
11 |
1 |
1 |
|
1120 x 4 u = 2.2 u |
12 x 9 u = 4.5 u |
|
(a)
Change ratio into units.
Number of adults = 4 u
(b)
Number of children = 9 u
Boys : Girls : Children
1 : 1 : 1 + 1
1 : 1 : 2
Fraction of the children that were boys =
12 Number of boys
=
12 x 9 u
= 4.5 u
(c)
Number of adults = 4 u
Fraction of the adults that were women =
1120 Number of women
=
1120 x 4 u
= 2.2 u
(d)
Difference between the number of boys and women
= 4.5 u - 2.2 u
= 2.3 u
Answer(s): (a) 4; (b) 4.5; (c) 2.2; (d) 2.3