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?
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
#### 371