Fill in the blanks.
The ratio of adults to children is 3 : 4.
The ratio of girls to boys is 1 : 2.
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 |
3x3 = 9 u |
4x3 = 12 u |
|
Girls |
Boys |
3 |
1x4 |
2x4 |
9 u |
4 u |
8 u |
(a)
Change ratio into units.
Girls : Boys : Children
1 : 2 : 1 + 2
1 : 2 : 3
The number of children is the repeated identity.
LCM of 4 and 3 is 12.
Number of adults = 9 u
(b)
Number of girls = 4 u
(c)
Difference in the number of boys and girls
= 8 u - 4 u
= 4 u
(d)
Total number of people
= 9 u + 12 u
= 21 u
Answer(s): (a) 9; (b) 4; (c) 4; (d) 21