Fill in the blanks in whole numbers or decimals.
The ratio of adults to children is 2 : 9.
The ratio of boys to girls is 7 : 8.
The number of men to women is 3 : 5.
Let the number of children be 9 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 |
9 u |
Men |
Women |
Boys |
Girls |
3 |
5 |
7 |
8 |
|
58 x 2 u = 1.25 u |
715 x 9 u = 4.2 u |
|
(a)
Change ratio into units.
Number of adults = 2 u
(b)
Number of children = 9 u
Boys : Girls : Children
7 : 8 : 7 + 8
7 : 8 : 15
Fraction of the children that were boys =
715 Number of boys
=
715 x 9 u
= 4.2 u
(c)
Number of adults = 2 u
Fraction of the adults that were women =
58 Number of women
=
58 x 2 u
= 1.25 u
(d)
Difference between the number of boys and women
= 4.2 u - 1.25 u
= 2.95 u
Answer(s): (a) 2; (b) 4.2; (c) 1.25; (d) 2.95