Fill in the blanks.
The ratio of adults to children is 3 : 1.
The ratio of boys to girls is 4 : 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 |
3x13 = 39 u |
1x13 = 13 u |
|
Boys |
Girls |
13 |
4x1 |
9x1 |
39 u |
4 u |
9 u |
(a)
Change ratio into units.
Boys : Girls : Children
4 : 9 : 4 + 9
4 : 9 : 13
The number of children is the repeated identity.
LCM of 1 and 13 is 13.
Number of adults = 39 u
(b)
Number of boys = 4 u
(c)
Difference in the number of girls and boys
= 9 u - 4 u
= 5 u
(d)
Total number of people
= 39 u + 13 u
= 52 u
Answer(s): (a) 39; (b) 4; (c) 5; (d) 52