First find out how many ounces of milk James had to begin with by multiplying the number of gallons by the number of ounces per gallon: 3 gallons * 128 ounces/gallon = <<3*128=384>>384 oz

Now subtract the 13 ounces James drank from the initial amount of milk: 384 oz - 13 oz = <<384-13=371>>371 oz

# Answer

371
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
James has 3 gallons of milk. He drank 13 ounces of the milk. If there are 128 ounces in a gallon, how many ounces of milk does James have left?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
371
James has 3 gallons of milk. He drank 13 ounces of the milk. If there are 128 ounces in a gallon, how many ounces of milk does James have left?
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