Fill in the blanks in whole numbers or fractions.
The ratio of adults to children is 1 : 4.
The ratio of boys to girls is 3 : 5.
The number of women to men is 1 : 4.
Let the number of children be 4 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Total number of people = _____ u
Adults |
Children |
1 u |
4 u |
Women |
Men |
Boys |
Girls |
1 |
4 |
3 |
5 |
|
45 x 1 u = 45 u |
38 x 4 u = 112 u |
|
(a)
Change ratio into units.
Boys : Girls : Children
3 : 5 : 3 + 5
3 : 5 : 8
Number of adults = 1 u
(b)
Number of children = 4 u
Fraction of the children that were boys =
38 Number of boys
=
38 x 4 u
= 1
12 u
(c)
Number of adults = 1 u
Fraction of the adults that were men =
45 Number of men
=
45 x 1 u
=
45 u
(d)
Total number of people
= 1 u + 4 u
= 5 u
Answer(s): (a) 1; (b) 1
12; (c)
45; (d) 5