Fill in the blanks.
The ratio of adults to children is 9 : 10.
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 |
9x13 = 117 u |
10x13 = 130 u |
|
Boys |
Girls |
13 |
4x10 |
9x10 |
117 u |
40 u |
90 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 10 and 13 is 130.
Number of adults = 117 u
(b)
Number of boys = 40 u
(c)
Difference in the number of girls and boys
= 90 u - 40 u
= 50 u
(d)
Total number of people
= 117 u + 130 u
= 247 u
Answer(s): (a) 117; (b) 40; (c) 50; (d) 247