1 gallon = 4 quarts
1 quart = 32 ounces, 1 quart = 32 ounces*1 glass/8 ounces = 4 glasses
1 quart = 4 glasses
1 gallon = 4 quarts = 16 glasses
If Sam drinks 4 glasses per day. and he has 16 glasses, then 16/4 = 4 days
Answer is 4 days.
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