Fill in the blanks.
The ratio of adults to children is 1 : 5.
The ratio of girls to boys is 7 : 8.
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 |
1x3 = 3 u |
5x3 = 15 u |
|
Girls |
Boys |
15 |
7x1 |
8x1 |
3 u |
7 u |
8 u |
(a)
Change ratio into units.
Girls : Boys : Children
7 : 8 : 7 + 8
7 : 8 : 15
The number of children is the repeated identity.
LCM of 5 and 15 is 15.
Number of adults = 3 u
(b)
Number of girls = 7 u
(c)
Difference in the number of boys and girls
= 8 u - 7 u
= 1 u
(d)
Total number of people
= 3 u + 15 u
= 18 u
Answer(s): (a) 3; (b) 7; (c) 1; (d) 18