Fill in the blanks.
The ratio of adults to children is 2 : 7.
The ratio of girls to boys is 1 : 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 |
2x5 = 10 u |
7x5 = 35 u |
|
Girls |
Boys |
5 |
1x7 |
4x7 |
10 u |
7 u |
28 u |
(a)
Change ratio into units.
Girls : Boys : Children
1 : 4 : 1 + 4
1 : 4 : 5
The number of children is the repeated identity.
LCM of 7 and 5 is 35.
Number of adults = 10 u
(b)
Number of girls = 7 u
(c)
Difference in the number of boys and girls
= 28 u - 7 u
= 21 u
(d)
Total number of people
= 10 u + 35 u
= 45 u
Answer(s): (a) 10; (b) 7; (c) 21; (d) 45