Fill in the blanks.
The ratio of adults to children is 9 : 7.
The ratio of girls to boys is 2 : 3.
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 |
9x5 = 45 u |
7x5 = 35 u |
|
Girls |
Boys |
5 |
2x7 |
3x7 |
45 u |
14 u |
21 u |
(a)
Change ratio into units.
Girls : Boys : Children
2 : 3 : 2 + 3
2 : 3 : 5
The number of children is the repeated identity.
LCM of 7 and 5 is 35.
Number of adults = 45 u
(b)
Number of girls = 14 u
(c)
Difference in the number of boys and girls
= 21 u - 14 u
= 7 u
(d)
Total number of people
= 45 u + 35 u
= 80 u
Answer(s): (a) 45; (b) 14; (c) 7; (d) 80