Fill in the blanks in whole numbers or fractions.
The ratio of adults to children is 9 : 7.
The ratio of boys to girls is 3 : 4.
The number of women to men is 2 : 1.
Let the number of children be 7 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Total number of people = _____ u
Adults |
Children |
9 u |
7 u |
Women |
Men |
Boys |
Girls |
2 |
1 |
3 |
4 |
|
13 x 9 u = 3 u |
37 x 7 u = 3 u |
|
(a)
Change ratio into units.
Boys : Girls : Children
3 : 4 : 3 + 4
3 : 4 : 7
Number of adults = 9 u
(b)
Number of children = 7 u
Fraction of the children that were boys =
37 Number of boys
=
37 x 7 u
= 3 u
(c)
Number of adults = 9 u
Fraction of the adults that were men =
13 Number of men
=
13 x 9 u
= 3 u
(d)
Total number of people
= 9 u + 7 u
= 16 u
Answer(s): (a) 9; (b) 3; (c) 3; (d) 16