27
12x4=48
then 3+3+3=9 because its 3/4
then you add 12 because of the 1
then 48-21=27
The answer is b. I know because I know my math. Hoped this helped.
Answer with Step-by-step explanation:
We are given that point B lies on the segment AC.
Length of AC= a cm
We have to find the the distance between the midpoint of segment AB and BC.
When B lies on the segment AC.
Let mid point of segment AB and BC are E and F.
E is the midpoint of segment AB.
Therefore, 





Distance between E and F is given by


Hence, the distance between the midpoints of segment AB and BC is given by

Answer:
Step-by-step explanation:
2/5 + 3/7 + 1/4 = 28/140 + 60/140 + 35/140 = 123/140