Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 3 : 5.
The ratio of boys to girls is 3 : 7.
The number of men to women is 7 : 5.
Let the number of children be 5 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of women = _____ u
- Difference between the number of boys and women = _____ u
Adults |
Children |
3 u |
5 u |
Men |
Women |
Boys |
Girls |
7 |
5 |
3 |
7 |
|
512 x 3 u = 1.25 u |
310 x 5 u = 1.5 u |
|
(a)
Change ratio into units.
Number of adults = 3 u
(b)
Number of children = 5 u
Boys : Girls : Children
3 : 7 : 3 + 7
3 : 7 : 10
Fraction of the children that were boys =
310 Number of boys
=
310 x 5 u
= 1.5 u
(c)
Number of adults = 3 u
Fraction of the adults that were women =
512 Number of women
=
512 x 3 u
= 1.25 u
(d)
Difference between the number of boys and women
= 1.5 u - 1.25 u
= 0.25 u
Answer(s): (a) 3; (b) 1.5; (c) 1.25; (d) 0.25