Fill in the blanks in whole numbers or fractions.
The ratio of adults to children is 7 : 3.
The ratio of boys to girls is 5 : 2.
The number of women to men is 2 : 1.
Let the number of children be 3 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Total number of people = _____ u
Adults |
Children |
7 u |
3 u |
Women |
Men |
Boys |
Girls |
2 |
1 |
5 |
2 |
|
13 x 7 u = 213 u |
57 x 3 u = 217 u |
|
(a)
Change ratio into units.
Boys : Girls : Children
5 : 2 : 5 + 2
5 : 2 : 7
Number of adults = 7 u
(b)
Number of children = 3 u
Fraction of the children that were boys =
57 Number of boys
=
57 x 3 u
= 2
17 u
(c)
Number of adults = 7 u
Fraction of the adults that were men =
13 Number of men
=
13 x 7 u
= 2
13 u
(d)
Total number of people
= 7 u + 3 u
= 10 u
Answer(s): (a) 7; (b) 2
17; (c) 2
13; (d) 10