Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 1 : 9.
The ratio of boys to girls is 2 : 3.
The number of women to men is 7 : 3.
Let the number of children be 9 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Difference between the number of boys and men = _____ u
Adults |
Children |
1 u |
9 u |
Women |
Men |
Boys |
Girls |
7 |
3 |
2 |
3 |
|
310 x 1 u = 0.3 u |
25 x 9 u = 3.6 u |
|
(a)
Change ratio into units.
Number of adults = 1 u
(b)
Number of children = 9 u
Boys : Girls : Children
2 : 3 : 2 + 3
2 : 3 : 5
Fraction of the children that were boys =
25 Number of boys
=
25 x 9 u
= 3.6 u
(c)
Number of adults = 1 u
Fraction of the adults that were men =
310 Number of men
=
310 x 1 u
= 0.3 u
(d)
Difference between the number of boys and men
= 3.6 u - 0.3 u
= 3.3 u
Answer(s): (a) 1; (b) 3.6; (c) 0.3; (d) 3.3