Fill in the blanks.
The ratio of adults to children is 7 : 5.
The ratio of girls to boys is 1 : 4.
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 |
7x1 = 7 u |
5x1 = 5 u |
|
Girls |
Boys |
5 |
1x1 |
4x1 |
7 u |
1 u |
4 u |
(a)
Change ratio into units.
Girls : Boys : Children
1 : 4 : 1 + 4
1 : 4 : 5
The number of children is the repeated identity.
LCM of 5 and 5 is 5.
Number of adults = 7 u
(b)
Number of girls = 1 u
(c)
Difference in the number of boys and girls
= 4 u - 1 u
= 3 u
(d)
Total number of people
= 7 u + 5 u
= 12 u
Answer(s): (a) 7; (b) 1; (c) 3; (d) 12