If B = 3A, C = 2A, find the value of (2a + b-2c) / (2b-a-c) (please list the formula)

If B = 3A, C = 2A, find the value of (2a + b-2c) / (2b-a-c) (please list the formula)

Substituting B = 3A and C = 2A, we get the following result
Original formula = (2a + 3a-4a) / (6a-a-2a)
=a/3a
=1/3