Fill in the blanks.
The ratio of adults to children is 4 : 9.
The ratio of girls to boys is 3 : 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 |
4x8 = 32 u |
9x8 = 72 u |
|
Girls |
Boys |
8 |
3x9 |
5x9 |
32 u |
27 u |
45 u |
(a)
Change ratio into units.
Girls : Boys : Children
3 : 5 : 3 + 5
3 : 5 : 8
The number of children is the repeated identity.
LCM of 9 and 8 is 72.
Number of adults = 32 u
(b)
Number of girls = 27 u
(c)
Difference in the number of boys and girls
= 45 u - 27 u
= 18 u
(d)
Total number of people
= 32 u + 72 u
= 104 u
Answer(s): (a) 32; (b) 27; (c) 18; (d) 104