Fill in the blanks.
The ratio of adults to children is 1 : 1.
The ratio of boys to girls is 5 : 7.
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 |
1x12 = 12 u |
1x12 = 12 u |
|
Boys |
Girls |
12 |
5x1 |
7x1 |
12 u |
5 u |
7 u |
(a)
Change ratio into units.
Boys : Girls : Children
5 : 7 : 5 + 7
5 : 7 : 12
The number of children is the repeated identity.
LCM of 1 and 12 is 12.
Number of adults = 12 u
(b)
Number of boys = 5 u
(c)
Difference in the number of girls and boys
= 7 u - 5 u
= 2 u
(d)
Total number of people
= 12 u + 12 u
= 24 u
Answer(s): (a) 12; (b) 5; (c) 2; (d) 24