It would be 3/10 because you have to create a common denominator. That would be 10. 3x2=6 and 5x2=10, so 3/5 would become 6/10, which is equivalent. If you kept the denominators the same and subtracted the numerators, you would get 3/10.
0.2 is a decimal between 0.25 and 0.125
Please look at the attached file
16, 23, 49, 55, 64
range = max - min = 64 - 16 = 48
The answer would probably be B