Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 3 : 4.
The ratio of boys to girls is 7 : 9.
The number of women to men is 7 : 3.
Let the number of children be 4 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 |
4 u |
Women |
Men |
Boys |
Girls |
7 |
3 |
7 |
9 |
|
310 x 3 u = 0.9 u |
716 x 4 u = 1.75 u |
|
(a)
Change ratio into units.
Number of adults = 3 u
(b)
Number of children = 4 u
Boys : Girls : Children
7 : 9 : 7 + 9
7 : 9 : 16
Fraction of the children that were boys =
716 Number of boys
=
716 x 4 u
= 1.75 u
(c)
Number of adults = 3 u
Fraction of the adults that were men =
310 Number of men
=
310 x 3 u
= 0.9 u
(d)
Difference between the number of boys and men
= 1.75 u - 0.9 u
= 0.85 u
Answer(s): (a) 3; (b) 1.75; (c) 0.9; (d) 0.85