Fill in the blanks.
The ratio of adults to children is 1 : 2.
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 |
1x7 = 7 u |
2x7 = 14 u |
|
Boys |
Girls |
7 |
2x2 |
5x2 |
7 u |
4 u |
10 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 2 and 7 is 14.
Number of adults = 7 u
(b)
Number of boys = 4 u
(c)
Difference in the number of girls and boys
= 10 u - 4 u
= 6 u
(d)
Total number of people
= 7 u + 14 u
= 21 u
Answer(s): (a) 7; (b) 4; (c) 6; (d) 21