Fill in the blanks.
The ratio of children to adults is 9 : 7.
The ratio of men to women is 9 : 11.
Use LCM and find the following.
- Number of children = _____ u
- Number of men = _____ u
- Difference in the number of women and men = _____ u
- Total number of people = _____ u
Children |
Adults |
9x20 = 180 u |
7x20 = 140 u |
|
Men |
Women |
20 |
9x7 |
11x7 |
180 u |
63 u |
77 u |
(a)
Change ratio into units.
Men : Women : Children
9 : 11 : 9 + 11
9 : 11 : 20
The number of adults is the repeated identity.
LCM of 7 and 20 is 140.
Number of children = 180 u
(b)
Number of men = 63 u
(c)
Difference in the number of women and men
= 77 u - 63 u
= 14 u
(d)
Total number of people
= 180 u + 140 u
= 320 u
Answer(s): (a) 180; (b) 63; (c) 14; (d) 320