Fill in the blanks.
The ratio of adults to children is 7 : 9.
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 |
7x1 = 7 u |
9x1 = 9 u |
|
Boys |
Girls |
3 |
1x3 |
2x3 |
7 u |
3 u |
6 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 9 and 3 is 9.
Number of adults = 7 u
(b)
Number of boys = 3 u
(c)
Difference in the number of girls and boys
= 6 u - 3 u
= 3 u
(d)
Total number of people
= 7 u + 9 u
= 16 u
Answer(s): (a) 7; (b) 3; (c) 3; (d) 16