Fill in the blanks.
The ratio of adults to children is 9 : 8.
The ratio of boys to girls is 4 : 11.
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 |
9x15 = 135 u |
8x15 = 120 u |
|
Boys |
Girls |
15 |
4x8 |
11x8 |
135 u |
32 u |
88 u |
(a)
Change ratio into units.
Boys : Girls : Children
4 : 11 : 4 + 11
4 : 11 : 15
The number of children is the repeated identity.
LCM of 8 and 15 is 120.
Number of adults = 135 u
(b)
Number of boys = 32 u
(c)
Difference in the number of girls and boys
= 88 u - 32 u
= 56 u
(d)
Total number of people
= 135 u + 120 u
= 255 u
Answer(s): (a) 135; (b) 32; (c) 56; (d) 255