Fill in the blanks.
The ratio of adults to children is 1 : 2.
The ratio of boys to girls is 7 : 11.
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 |
1x9 = 9 u |
2x9 = 18 u |
|
Boys |
Girls |
18 |
7x1 |
11x1 |
9 u |
7 u |
11 u |
(a)
Change ratio into units.
Boys : Girls : Children
7 : 11 : 7 + 11
7 : 11 : 18
The number of children is the repeated identity.
LCM of 2 and 18 is 18.
Number of adults = 9 u
(b)
Number of boys = 7 u
(c)
Difference in the number of girls and boys
= 11 u - 7 u
= 4 u
(d)
Total number of people
= 9 u + 18 u
= 27 u
Answer(s): (a) 9; (b) 7; (c) 4; (d) 27