Fill in the blanks.
The ratio of adults to children is 3 : 5.
The ratio of boys to girls is 1 : 6.
Use LCM and find the following.
- Number of adults = _____ u
- Number of boys = _____ u
- Difference in the number of girls and boys = _____ u
- Total number of people = _____ u
Adults |
Children |
3x7 = 21 u |
5x7 = 35 u |
|
Boys |
Girls |
7 |
1x5 |
6x5 |
21 u |
5 u |
30 u |
(a)
Change ratio into units.
Boys : Girls : Children
1 : 6 : 1 + 6
1 : 6 : 7
The number of children is the repeated identity.
LCM of 5 and 7 is 35.
Number of adults = 21 u
(b)
Number of boys = 5 u
(c)
Difference in the number of girls and boys
= 30 u - 5 u
= 25 u
(d)
Total number of people
= 21 u + 35 u
= 56 u
Answer(s): (a) 21; (b) 5; (c) 25; (d) 56