Write a function to find the median of three specific numbers.
def median_numbers(a,b,c):
 if a > b:
    if a < c:
        median = a
    elif b > c:
        median = b
    else:
        median = c
 else:
    if a > c:
        median = a
    elif b < c:
        median = b
    else:
        median = c
 return median
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a function to find the median of three specific numbers.
def median_numbers(a,b,c):
 if a > b:
    if a < c:
        median = a
    elif b > c:
        median = b
    else:
        median = c
 else:
    if a > c:
        median = a
    elif b < c:
        median = b
    else:
        median = c
 return median[/INST]assert median_numbers(25,55,65)==55.0
assert median_numbers(20,10,30)==20.0
assert median_numbers(15,45,75)==45.0</s>