Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 2 : 9.
The ratio of boys to girls is 1 : 4.
The number of women to men is 1 : 7.
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 |
2 u |
9 u |
Women |
Men |
Boys |
Girls |
1 |
7 |
1 |
4 |
|
78 x 2 u = 1.75 u |
15 x 9 u = 1.8 u |
|
(a)
Change ratio into units.
Number of adults = 2 u
(b)
Number of children = 9 u
Boys : Girls : Children
1 : 4 : 1 + 4
1 : 4 : 5
Fraction of the children that were boys =
15 Number of boys
=
15 x 9 u
= 1.8 u
(c)
Number of adults = 2 u
Fraction of the adults that were men =
78 Number of men
=
78 x 2 u
= 1.75 u
(d)
Difference between the number of boys and men
= 1.8 u - 1.75 u
= 0.05 u
Answer(s): (a) 2; (b) 1.8; (c) 1.75; (d) 0.05