Fill in the blanks.
The ratio of adults to children is 5 : 7.
The ratio of boys to girls is 2 : 3.
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 |
5x5 = 25 u |
7x5 = 35 u |
|
Boys |
Girls |
5 |
2x7 |
3x7 |
25 u |
14 u |
21 u |
(a)
Change ratio into units.
Boys : Girls : Children
2 : 3 : 2 + 3
2 : 3 : 5
The number of children is the repeated identity.
LCM of 7 and 5 is 35.
Number of adults = 25 u
(b)
Number of boys = 14 u
(c)
Difference in the number of girls and boys
= 21 u - 14 u
= 7 u
(d)
Total number of people
= 25 u + 35 u
= 60 u
Answer(s): (a) 25; (b) 14; (c) 7; (d) 60