Fill in the blanks.
The ratio of adults to children is 9 : 11.
The ratio of boys to girls is 2 : 5.
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 |
11x7 = 77 u |
|
Boys |
Girls |
7 |
2x11 |
5x11 |
63 u |
22 u |
55 u |
(a)
Change ratio into units.
Boys : Girls : Children
2 : 5 : 2 + 5
2 : 5 : 7
The number of children is the repeated identity.
LCM of 11 and 7 is 77.
Number of adults = 63 u
(b)
Number of boys = 22 u
(c)
Difference in the number of girls and boys
= 55 u - 22 u
= 33 u
(d)
Total number of people
= 63 u + 77 u
= 140 u
Answer(s): (a) 63; (b) 22; (c) 33; (d) 140