Fill in the blanks.
The ratio of adults to children is 1 : 4.
The ratio of girls to boys is 5 : 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 |
1x7 = 7 u |
4x7 = 28 u |
|
Girls |
Boys |
14 |
5x2 |
9x2 |
7 u |
10 u |
18 u |
(a)
Change ratio into units.
Girls : Boys : Children
5 : 9 : 5 + 9
5 : 9 : 14
The number of children is the repeated identity.
LCM of 4 and 14 is 28.
Number of adults = 7 u
(b)
Number of girls = 10 u
(c)
Difference in the number of boys and girls
= 18 u - 10 u
= 8 u
(d)
Total number of people
= 7 u + 28 u
= 35 u
Answer(s): (a) 7; (b) 10; (c) 8; (d) 35