Quote:
Originally Posted by GH85Carrera
I suggested to her we just mark the level, remove a gallon carefully and measure the difference. She wanted a math solution and I knew where to ask the question.
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Wait - as I understood the OP it wasn't possible to measure the quantity removed. If you can measure the amount you remove and you want to remove 15 gallons, just "...remove a gallon carefully" 15 times.
I hope my earlier answer was helpful. As far as I can see it was the only response that actually answered your question.