Fill in the blanks in whole numbers or fractions.
The ratio of adults to children is 7 : 9.
The ratio of boys to girls is 1 : 2.
The number of women to men is 2 : 5.
Let the number of children be 9 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Total number of people = _____ u
Adults |
Children |
7 u |
9 u |
Women |
Men |
Boys |
Girls |
2 |
5 |
1 |
2 |
|
57 x 7 u = 5 u |
13 x 9 u = 3 u |
|
(a)
Change ratio into units.
Boys : Girls : Children
1 : 2 : 1 + 2
1 : 2 : 3
Number of adults = 7 u
(b)
Number of children = 9 u
Fraction of the children that were boys =
13 Number of boys
=
13 x 9 u
= 3 u
(c)
Number of adults = 7 u
Fraction of the adults that were men =
57 Number of men
=
57 x 7 u
= 5 u
(d)
Total number of people
= 7 u + 9 u
= 16 u
Answer(s): (a) 7; (b) 3; (c) 5; (d) 16