Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 3 : 8.
The ratio of boys to girls is 5 : 11.
The number of women to men is 5 : 7.
Let the number of children be 8 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Difference between the number of boys and men = _____ u
Adults |
Children |
3 u |
8 u |
Women |
Men |
Boys |
Girls |
5 |
7 |
5 |
11 |
|
712 x 3 u = 1.75 u |
516 x 8 u = 2.5 u |
|
(a)
Change ratio into units.
Number of adults = 3 u
(b)
Number of children = 8 u
Boys : Girls : Children
5 : 11 : 5 + 11
5 : 11 : 16
Fraction of the children that were boys =
516 Number of boys
=
516 x 8 u
= 2.5 u
(c)
Number of adults = 3 u
Fraction of the adults that were men =
712 Number of men
=
712 x 3 u
= 1.75 u
(d)
Difference between the number of boys and men
= 2.5 u - 1.75 u
= 0.75 u
Answer(s): (a) 3; (b) 2.5; (c) 1.75; (d) 0.75