Fill in the blanks.
The ratio of adults to children is 7 : 11.
The ratio of boys to girls is 3 : 10.
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 |
11x13 = 143 u |
|
Boys |
Girls |
13 |
3x11 |
10x11 |
91 u |
33 u |
110 u |
(a)
Change ratio into units.
Boys : Girls : Children
3 : 10 : 3 + 10
3 : 10 : 13
The number of children is the repeated identity.
LCM of 11 and 13 is 143.
Number of adults = 91 u
(b)
Number of boys = 33 u
(c)
Difference in the number of girls and boys
= 110 u - 33 u
= 77 u
(d)
Total number of people
= 91 u + 143 u
= 234 u
Answer(s): (a) 91; (b) 33; (c) 77; (d) 234