Fill in the blanks.
The ratio of adults to children is 3 : 4.
The ratio of girls to boys is 1 : 6.
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 |
3x7 = 21 u |
4x7 = 28 u |
|
Girls |
Boys |
7 |
1x4 |
6x4 |
21 u |
4 u |
24 u |
(a)
Change ratio into units.
Girls : Boys : Children
1 : 6 : 1 + 6
1 : 6 : 7
The number of children is the repeated identity.
LCM of 4 and 7 is 28.
Number of adults = 21 u
(b)
Number of girls = 4 u
(c)
Difference in the number of boys and girls
= 24 u - 4 u
= 20 u
(d)
Total number of people
= 21 u + 28 u
= 49 u
Answer(s): (a) 21; (b) 4; (c) 20; (d) 49