Posted 02-02-2005 at 04:16:47
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You have 2 containers
1 has 100 white marbles the other has 100 black marbles
If you take 20 black marbles and mix them in with the white marbles you now have a mixture of 120 marbles 20 of which are black
Then you reach into that mix and grab another 20 marbles ... any combination of white and black marbles will work.
Say you pull out 15 white and 5 black and mix them back into the 80 black marbles the count is now
85 white and 15 black in container 1
85 black and 15 white in container 2
We will do a few more just to show you it works all the time
Say you pull out 19 white and 1 black and mix them back into the 80 black marbles the count is now
81 white and 19 black in container 1
81 black and 19 white in container 2
Say you pull out 0 white and 20 black and mix them back into the 80 black marbles the count is now
100 white and 0 black in container 1
100 black and 0 white in container 2
Say you pull out 20 white and 0 black and mix them back into the 80 black marbles the count is now
80 white and 20 black in container 1
80 black and 20 white in container 2
It works the same way with the liquid ....
Some find this one easy other think it is counter intuitive.....