Fill in the blanks.
The ratio of adults to children is 1 : 4.
The ratio of boys to girls is 7 : 12.
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 |
1x19 = 19 u |
4x19 = 76 u |
|
Boys |
Girls |
19 |
7x4 |
12x4 |
19 u |
28 u |
48 u |
(a)
Change ratio into units.
Boys : Girls : Children
7 : 12 : 7 + 12
7 : 12 : 19
The number of children is the repeated identity.
LCM of 4 and 19 is 76.
Number of adults = 19 u
(b)
Number of boys = 28 u
(c)
Difference in the number of girls and boys
= 48 u - 28 u
= 20 u
(d)
Total number of people
= 19 u + 76 u
= 95 u
Answer(s): (a) 19; (b) 28; (c) 20; (d) 95