Fill in the blanks.
The ratio of adults to children is 3 : 7.
The ratio of girls to boys is 1 : 5.
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 |
3x6 = 18 u |
7x6 = 42 u |
|
Girls |
Boys |
6 |
1x7 |
5x7 |
18 u |
7 u |
35 u |
(a)
Change ratio into units.
Girls : Boys : Children
1 : 5 : 1 + 5
1 : 5 : 6
The number of children is the repeated identity.
LCM of 7 and 6 is 42.
Number of adults = 18 u
(b)
Number of girls = 7 u
(c)
Difference in the number of boys and girls
= 35 u - 7 u
= 28 u
(d)
Total number of people
= 18 u + 42 u
= 60 u
Answer(s): (a) 18; (b) 7; (c) 28; (d) 60