Fill in the blanks.
The ratio of adults to children is 9 : 2.
The ratio of girls to boys is 2 : 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 |
9x7 = 63 u |
2x7 = 14 u |
|
Girls |
Boys |
7 |
2x2 |
5x2 |
63 u |
4 u |
10 u |
(a)
Change ratio into units.
Girls : Boys : Children
2 : 5 : 2 + 5
2 : 5 : 7
The number of children is the repeated identity.
LCM of 2 and 7 is 14.
Number of adults = 63 u
(b)
Number of girls = 4 u
(c)
Difference in the number of boys and girls
= 10 u - 4 u
= 6 u
(d)
Total number of people
= 63 u + 14 u
= 77 u
Answer(s): (a) 63; (b) 4; (c) 6; (d) 77