One liter of water is almost exactly one kilogram.
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At 28 mpg you will need at least 28.391 liters of gasoline to travel 210 miles.
Assuming the medium is fresh water at room temperature and atmospheric pressure, then the density is 1 gram per one milliliter 28000 grams = 28000/1 = 28000 milliliter = 28 liters (as 1 liter = 1000 milliliter)
that is 28 cups
11
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