Question 253777
4/5 is the same as 8/10
.9 is the same as 9/10
halfway between would be 8.5/10 = 17/20


that would be selection C.


8/10 is the same as 16/20
9/10 is the same as 18/20


18/20-16/20 = 2/20 / 2 = 1/20

16/20 + 1/20 = 17/20
18/20 - 1/20 = 17/20