Fill in the blanks.
The ratio of adults to children is 7 : 6.
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 |
7x13 = 91 u |
6x13 = 78 u |
|
Boys |
Girls |
13 |
2x6 |
11x6 |
91 u |
12 u |
66 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 6 and 13 is 78.
Number of adults = 91 u
(b)
Number of boys = 12 u
(c)
Difference in the number of girls and boys
= 66 u - 12 u
= 54 u
(d)
Total number of people
= 91 u + 78 u
= 169 u
Answer(s): (a) 91; (b) 12; (c) 54; (d) 169