Fill in the blanks.
The ratio of adults to children is 1 : 1.
The ratio of girls to boys is 7 : 11.
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 |
1x18 = 18 u |
1x18 = 18 u |
|
Girls |
Boys |
18 |
7x1 |
11x1 |
18 u |
7 u |
11 u |
(a)
Change ratio into units.
Girls : Boys : Children
7 : 11 : 7 + 11
7 : 11 : 18
The number of children is the repeated identity.
LCM of 1 and 18 is 18.
Number of adults = 18 u
(b)
Number of girls = 7 u
(c)
Difference in the number of boys and girls
= 11 u - 7 u
= 4 u
(d)
Total number of people
= 18 u + 18 u
= 36 u
Answer(s): (a) 18; (b) 7; (c) 4; (d) 36