A. Order the numbers so that 1 is in the middle:
-20, -12, -8, -1, 1, 5, 10, x, x -> The other 2 numbers must be greater than 1, as the range can be 2 < x, x being the number chosen
B. Order the numbers so that -3 is in the middle:
x, -20, -12, -8, (-3), -1, 1, 5, 10 -> The other number must be less than -3, as the range is x < - 3, x being the number chosen
hope this helps