Fill in the blanks.
The ratio of adults to children is 4 : 3.
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 |
4x5 = 20 u |
3x5 = 15 u |
|
Girls |
Boys |
5 |
2x3 |
3x3 |
20 u |
6 u |
9 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 3 and 5 is 15.
Number of adults = 20 u
(b)
Number of girls = 6 u
(c)
Difference in the number of boys and girls
= 9 u - 6 u
= 3 u
(d)
Total number of people
= 20 u + 15 u
= 35 u
Answer(s): (a) 20; (b) 6; (c) 3; (d) 35