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 5 : 3.
The number of men to women is 1 : 4.
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 |
1 |
4 |
5 |
3 |
|
45 x 7 u = 5.6 u |
58 x 12 u = 7.5 u |
|
(a)
Change ratio into units.
Number of adults = 7 u
(b)
Number of children = 12 u
Boys : Girls : Children
5 : 3 : 5 + 3
5 : 3 : 8
Fraction of the children that were boys =
58 Number of boys
=
58 x 12 u
= 7.5 u
(c)
Number of adults = 7 u
Fraction of the adults that were women =
45 Number of women
=
45 x 7 u
= 5.6 u
(d)
Difference between the number of boys and women
= 7.5 u - 5.6 u
= 1.9 u
Answer(s): (a) 7; (b) 7.5; (c) 5.6; (d) 1.9