Fill in the blanks.
The ratio of adults to children is 9 : 4.
The ratio of boys to girls is 3 : 4.
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 |
9x7 = 63 u |
4x7 = 28 u |
|
Boys |
Girls |
7 |
3x4 |
4x4 |
63 u |
12 u |
16 u |
(a)
Change ratio into units.
Boys : Girls : Children
3 : 4 : 3 + 4
3 : 4 : 7
The number of children is the repeated identity.
LCM of 4 and 7 is 28.
Number of adults = 63 u
(b)
Number of boys = 12 u
(c)
Difference in the number of girls and boys
= 16 u - 12 u
= 4 u
(d)
Total number of people
= 63 u + 28 u
= 91 u
Answer(s): (a) 63; (b) 12; (c) 4; (d) 91