Fill in the blanks.
The ratio of adults to children is 2 : 3.
The ratio of girls to boys is 3 : 4.
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 |
2x7 = 14 u |
3x7 = 21 u |
|
Girls |
Boys |
7 |
3x3 |
4x3 |
14 u |
9 u |
12 u |
(a)
Change ratio into units.
Girls : Boys : Children
3 : 4 : 3 + 4
3 : 4 : 7
The number of children is the repeated identity.
LCM of 3 and 7 is 21.
Number of adults = 14 u
(b)
Number of girls = 9 u
(c)
Difference in the number of boys and girls
= 12 u - 9 u
= 3 u
(d)
Total number of people
= 14 u + 21 u
= 35 u
Answer(s): (a) 14; (b) 9; (c) 3; (d) 35