Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 2 : 7.
The ratio of boys to girls is 9 : 11.
The number of men to women is 1 : 3.
Let the number of children be 7 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of women = _____ u
- Difference between the number of boys and women = _____ u
Adults |
Children |
2 u |
7 u |
Men |
Women |
Boys |
Girls |
1 |
3 |
9 |
11 |
|
34 x 2 u = 1.5 u |
920 x 7 u = 3.15 u |
|
(a)
Change ratio into units.
Number of adults = 2 u
(b)
Number of children = 7 u
Boys : Girls : Children
9 : 11 : 9 + 11
9 : 11 : 20
Fraction of the children that were boys =
920 Number of boys
=
920 x 7 u
= 3.15 u
(c)
Number of adults = 2 u
Fraction of the adults that were women =
34 Number of women
=
34 x 2 u
= 1.5 u
(d)
Difference between the number of boys and women
= 3.15 u - 1.5 u
= 1.65 u
Answer(s): (a) 2; (b) 3.15; (c) 1.5; (d) 1.65