Fill in the blanks.
The ratio of adults to children is 1 : 3.
The ratio of boys to girls is 4 : 5.
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 |
1x3 = 3 u |
3x3 = 9 u |
|
Boys |
Girls |
9 |
4x1 |
5x1 |
3 u |
4 u |
5 u |
(a)
Change ratio into units.
Boys : Girls : Children
4 : 5 : 4 + 5
4 : 5 : 9
The number of children is the repeated identity.
LCM of 3 and 9 is 9.
Number of adults = 3 u
(b)
Number of boys = 4 u
(c)
Difference in the number of girls and boys
= 5 u - 4 u
= 1 u
(d)
Total number of people
= 3 u + 9 u
= 12 u
Answer(s): (a) 3; (b) 4; (c) 1; (d) 12