Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 4 : 7.
The ratio of boys to girls is 7 : 3.
The number of men to women is 1 : 9.
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 |
4 u |
7 u |
Men |
Women |
Boys |
Girls |
1 |
9 |
7 |
3 |
|
910 x 4 u = 3.6 u |
710 x 7 u = 4.9 u |
|
(a)
Change ratio into units.
Number of adults = 4 u
(b)
Number of children = 7 u
Boys : Girls : Children
7 : 3 : 7 + 3
7 : 3 : 10
Fraction of the children that were boys =
710 Number of boys
=
710 x 7 u
= 4.9 u
(c)
Number of adults = 4 u
Fraction of the adults that were women =
910 Number of women
=
910 x 4 u
= 3.6 u
(d)
Difference between the number of boys and women
= 4.9 u - 3.6 u
= 1.3 u
Answer(s): (a) 4; (b) 4.9; (c) 3.6; (d) 1.3