SOLUTION: I went to a stream with 3 gallons. 40L, 50L and 100L. How can I put exactly 70L of water in the 100L gallon without pouring any water I ve put in the gallons back to the stream.

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Question 840496: I went to a stream with 3 gallons. 40L, 50L and 100L. How
can I put exactly 70L of water in the 100L gallon without
pouring any water I ve put in the gallons back to the
stream.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
fill up the 50 Liter container
empty that into the 40 which will leave 10 L in the 50L
pour those ten liters into the 100L
pour the 40 liters back into the 50L
fill up the 50 liter from the stream
fill up the 40L from the 50 again leaving 10L in the 50
pour those 10 into the 100L . Now you have 20 liters in the 100L
pour the 40 from the 40L into the 50. fill up the 50L from the stream
pour those 50L into the 100L
Now you have 70L in the 100L and the other two (40L and 50L ) are empty