Fill in the blanks.
The ratio of adults to children is 1 : 12.
The ratio of boys to girls is 1 : 4.
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 |
1x5 = 5 u |
12x5 = 60 u |
|
Boys |
Girls |
5 |
1x12 |
4x12 |
5 u |
12 u |
48 u |
(a)
Change ratio into units.
Boys : Girls : Children
1 : 4 : 1 + 4
1 : 4 : 5
The number of children is the repeated identity.
LCM of 12 and 5 is 60.
Number of adults = 5 u
(b)
Number of boys = 12 u
(c)
Difference in the number of girls and boys
= 48 u - 12 u
= 36 u
(d)
Total number of people
= 5 u + 60 u
= 65 u
Answer(s): (a) 5; (b) 12; (c) 36; (d) 65