Fill in the blanks.
The ratio of adults to children is 1 : 9.
The ratio of girls to boys is 2 : 3.
Use LCM and find the following.
- Number of adults = _____ u
- Number of girls = _____ u
- Difference in the number of boys and girls = _____ u
- Total number of people = _____ u
Adults |
Children |
1x5 = 5 u |
9x5 = 45 u |
|
Girls |
Boys |
5 |
2x9 |
3x9 |
5 u |
18 u |
27 u |
(a)
Change ratio into units.
Girls : Boys : Children
2 : 3 : 2 + 3
2 : 3 : 5
The number of children is the repeated identity.
LCM of 9 and 5 is 45.
Number of adults = 5 u
(b)
Number of girls = 18 u
(c)
Difference in the number of boys and girls
= 27 u - 18 u
= 9 u
(d)
Total number of people
= 5 u + 45 u
= 50 u
Answer(s): (a) 5; (b) 18; (c) 9; (d) 50