Fill in the blanks.
The ratio of adults to children is 1 : 2.
The ratio of girls to boys is 2 : 9.
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 |
1x11 = 11 u |
2x11 = 22 u |
|
Girls |
Boys |
11 |
2x2 |
9x2 |
11 u |
4 u |
18 u |
(a)
Change ratio into units.
Girls : Boys : Children
2 : 9 : 2 + 9
2 : 9 : 11
The number of children is the repeated identity.
LCM of 2 and 11 is 22.
Number of adults = 11 u
(b)
Number of girls = 4 u
(c)
Difference in the number of boys and girls
= 18 u - 4 u
= 14 u
(d)
Total number of people
= 11 u + 22 u
= 33 u
Answer(s): (a) 11; (b) 4; (c) 14; (d) 33