Fill in the blanks.
The ratio of children to adults is 2 : 7.
The ratio of women to men is 3 : 7.
Use LCM and find the following.
- Number of children = _____ u
- Number of women = _____ u
- Difference in the number of men and women = _____ u
- Total number of people = _____ u
Children |
Adults |
2x10 = 20 u |
7x10 = 70 u |
|
Women |
Men |
10 |
3x7 |
7x7 |
20 u |
21 u |
49 u |
(a)
Change ratio into units.
Women : Men : Children
3 : 7 : 3 + 7
3 : 7 : 10
The number of adults is the repeated identity.
LCM of 7 and 10 is 70.
Number of children = 20 u
(b)
Number of women = 21 u
(c)
Difference in the number of men and women
= 49 u - 21 u
= 28 u
(d)
Total number of people
= 20 u + 70 u
= 90 u
Answer(s): (a) 20; (b) 21; (c) 28; (d) 90