Fill in the blanks.
The ratio of adults to children is 5 : 3.
The ratio of boys to girls is 2 : 9.
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 |
5x11 = 55 u |
3x11 = 33 u |
|
Boys |
Girls |
11 |
2x3 |
9x3 |
55 u |
6 u |
27 u |
(a)
Change ratio into units.
Boys : Girls : Children
2 : 9 : 2 + 9
2 : 9 : 11
The number of children is the repeated identity.
LCM of 3 and 11 is 33.
Number of adults = 55 u
(b)
Number of boys = 6 u
(c)
Difference in the number of girls and boys
= 27 u - 6 u
= 21 u
(d)
Total number of people
= 55 u + 33 u
= 88 u
Answer(s): (a) 55; (b) 6; (c) 21; (d) 88