1) Yogurt is 80% water.
2) He can take lactaid for the lactose (which there isn't as much as milk anyways).
3) If he pukes it is -1 yogurt and it ends. So if he pukes his 80th, the final tally is 79.
4) To eat 50 is only about 3 gallons, 80% of which is water, and only 4000 calories.
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