Fill in the blanks.
The ratio of adults to children is 3 : 5.
The ratio of boys to girls is 2 : 11.
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 |
3x13 = 39 u |
5x13 = 65 u |
|
Boys |
Girls |
13 |
2x5 |
11x5 |
39 u |
10 u |
55 u |
(a)
Change ratio into units.
Boys : Girls : Children
2 : 11 : 2 + 11
2 : 11 : 13
The number of children is the repeated identity.
LCM of 5 and 13 is 65.
Number of adults = 39 u
(b)
Number of boys = 10 u
(c)
Difference in the number of girls and boys
= 55 u - 10 u
= 45 u
(d)
Total number of people
= 39 u + 65 u
= 104 u
Answer(s): (a) 39; (b) 10; (c) 45; (d) 104