Fill in the blanks.
The ratio of adults to children is 1 : 9.
The ratio of girls to boys is 1 : 9.
Use LCM and find the following.
- Number of adults = _____ u
- Number of girls = _____ u
- Difference in the number of boys and girls = _____ u
- Total number of people = _____ u
Adults |
Children |
1x10 = 10 u |
9x10 = 90 u |
|
Girls |
Boys |
10 |
1x9 |
9x9 |
10 u |
9 u |
81 u |
(a)
Change ratio into units.
Girls : Boys : Children
1 : 9 : 1 + 9
1 : 9 : 10
The number of children is the repeated identity.
LCM of 9 and 10 is 90.
Number of adults = 10 u
(b)
Number of girls = 9 u
(c)
Difference in the number of boys and girls
= 81 u - 9 u
= 72 u
(d)
Total number of people
= 10 u + 90 u
= 100 u
Answer(s): (a) 10; (b) 9; (c) 72; (d) 100