Fill in the blanks.
The ratio of adults to children is 9 : 10.
The ratio of girls to boys is 3 : 11.
Use LCM and find the following.
- Number of adults = _____ u
- Number of girls = _____ u
- Difference in the number of boys and girls = _____ u
- Total number of people = _____ u
Adults |
Children |
9x7 = 63 u |
10x7 = 70 u |
|
Girls |
Boys |
14 |
3x5 |
11x5 |
63 u |
15 u |
55 u |
(a)
Change ratio into units.
Girls : Boys : Children
3 : 11 : 3 + 11
3 : 11 : 14
The number of children is the repeated identity.
LCM of 10 and 14 is 70.
Number of adults = 63 u
(b)
Number of girls = 15 u
(c)
Difference in the number of boys and girls
= 55 u - 15 u
= 40 u
(d)
Total number of people
= 63 u + 70 u
= 133 u
Answer(s): (a) 63; (b) 15; (c) 40; (d) 133