Fill in the blanks.
The ratio of adults to children is 4 : 5.
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 |
4x7 = 28 u |
5x7 = 35 u |
|
Boys |
Girls |
7 |
2x5 |
5x5 |
28 u |
10 u |
25 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 5 and 7 is 35.
Number of adults = 28 u
(b)
Number of boys = 10 u
(c)
Difference in the number of girls and boys
= 25 u - 10 u
= 15 u
(d)
Total number of people
= 28 u + 35 u
= 63 u
Answer(s): (a) 28; (b) 10; (c) 15; (d) 63