Let s be the amount of soda Carla drank and w be the amount of water she drank.

We know that s + w = 54 and s = 3w - 6.

Substituting the second equation into the first, we get 3w - 6 + w = 54.

Combining like terms, we get 4w - 6 = 54

Adding 6 to both sides, we get 4w = 60

Dividing both sides by 4, we get w = 15

# Answer

15
<|im_start|>system
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<|im_start|>user
Compared to the amount of water she drank, Carla drank three times as much soda minus 6 ounces. If she drank 54 ounces of liquid total, how much water did she drink?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
15
Compared to the amount of water she drank, Carla drank three times as much soda minus 6 ounces. If she drank 54 ounces of liquid total, how much water did she drink?
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