Fill in the blanks.
The ratio of adults to children is 3 : 1.
The ratio of boys to girls is 1 : 2.
Use LCM and find the following.
- Number of adults = _____ u
- Number of boys = _____ u
- Difference in the number of girls and boys = _____ u
- Total number of people = _____ u
Adults |
Children |
3x3 = 9 u |
1x3 = 3 u |
|
Boys |
Girls |
3 |
1x1 |
2x1 |
9 u |
1 u |
2 u |
(a)
Change ratio into units.
Boys : Girls : Children
1 : 2 : 1 + 2
1 : 2 : 3
The number of children is the repeated identity.
LCM of 1 and 3 is 3.
Number of adults = 9 u
(b)
Number of boys = 1 u
(c)
Difference in the number of girls and boys
= 2 u - 1 u
= 1 u
(d)
Total number of people
= 9 u + 3 u
= 12 u
Answer(s): (a) 9; (b) 1; (c) 1; (d) 12