Fill in the blanks.
The ratio of adults to children is 2 : 5.
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 |
2x1 = 2 u |
5x1 = 5 u |
|
Boys |
Girls |
5 |
1x1 |
4x1 |
2 u |
1 u |
4 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 5 and 5 is 5.
Number of adults = 2 u
(b)
Number of boys = 1 u
(c)
Difference in the number of girls and boys
= 4 u - 1 u
= 3 u
(d)
Total number of people
= 2 u + 5 u
= 7 u
Answer(s): (a) 2; (b) 1; (c) 3; (d) 7