Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 9 : 7.
The ratio of boys to girls is 1 : 1.
The number of men to women is 2 : 1.
Let the number of children be 7 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of women = _____ u
- Difference between the number of boys and women = _____ u
Adults |
Children |
9 u |
7 u |
Men |
Women |
Boys |
Girls |
2 |
1 |
1 |
1 |
|
13 x 9 u = 3 u |
12 x 7 u = 3.5 u |
|
(a)
Change ratio into units.
Number of adults = 9 u
(b)
Number of children = 7 u
Boys : Girls : Children
1 : 1 : 1 + 1
1 : 1 : 2
Fraction of the children that were boys =
12 Number of boys
=
12 x 7 u
= 3.5 u
(c)
Number of adults = 9 u
Fraction of the adults that were women =
13 Number of women
=
13 x 9 u
= 3 u
(d)
Difference between the number of boys and women
= 3.5 u - 3 u
= 0.5 u
Answer(s): (a) 9; (b) 3.5; (c) 3; (d) 0.5