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 2 : 3.
The number of men to women is 2 : 3.
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 |
2 |
3 |
2 |
3 |
|
35 x 7 u = 4.2 u |
25 x 12 u = 4.8 u |
|
(a)
Change ratio into units.
Number of adults = 7 u
(b)
Number of children = 12 u
Boys : Girls : Children
2 : 3 : 2 + 3
2 : 3 : 5
Fraction of the children that were boys =
25 Number of boys
=
25 x 12 u
= 4.8 u
(c)
Number of adults = 7 u
Fraction of the adults that were women =
35 Number of women
=
35 x 7 u
= 4.2 u
(d)
Difference between the number of boys and women
= 4.8 u - 4.2 u
= 0.6 u
Answer(s): (a) 7; (b) 4.8; (c) 4.2; (d) 0.6