Question 940771
The water on earth can be split into salty seawater and fresh river water. Humans animals and plants can only drink freshwater. But only 2.6% of all the water on earth is fresh. 1.82% of this water is locked away in ice sheets and glaciers. 
This leaves only 0.78% available which is safe for us to drink. 
If there is 1,386,000,000km3 (cubed) of water on the earth how much is safe to drink?
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Ans: 0.0078*1386000000 = 10,810,800 km^3
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Cheers,
Stan H.
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