Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 7 : 12.
The ratio of boys to girls is 1 : 4.
The number of men to women is 3 : 1.
Let the number of children be 12 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of women = _____ u
- Difference between the number of boys and women = _____ u
Adults |
Children |
7 u |
12 u |
Men |
Women |
Boys |
Girls |
3 |
1 |
1 |
4 |
|
14 x 7 u = 1.75 u |
15 x 12 u = 2.4 u |
|
(a)
Change ratio into units.
Number of adults = 7 u
(b)
Number of children = 12 u
Boys : Girls : Children
1 : 4 : 1 + 4
1 : 4 : 5
Fraction of the children that were boys =
15 Number of boys
=
15 x 12 u
= 2.4 u
(c)
Number of adults = 7 u
Fraction of the adults that were women =
14 Number of women
=
14 x 7 u
= 1.75 u
(d)
Difference between the number of boys and women
= 2.4 u - 1.75 u
= 0.65 u
Answer(s): (a) 7; (b) 2.4; (c) 1.75; (d) 0.65