Fill in the blanks.
The ratio of adults to children is 1 : 10.
The ratio of girls to boys is 2 : 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 |
1x7 = 7 u |
10x7 = 70 u |
|
Girls |
Boys |
7 |
2x10 |
5x10 |
7 u |
20 u |
50 u |
(a)
Change ratio into units.
Girls : Boys : Children
2 : 5 : 2 + 5
2 : 5 : 7
The number of children is the repeated identity.
LCM of 10 and 7 is 70.
Number of adults = 7 u
(b)
Number of girls = 20 u
(c)
Difference in the number of boys and girls
= 50 u - 20 u
= 30 u
(d)
Total number of people
= 7 u + 70 u
= 77 u
Answer(s): (a) 7; (b) 20; (c) 30; (d) 77