Posted by justin on Monday, January 28, 2013 at 11:50pm.
r = 3d/4, or 4r = 3d
r/2 / (3d/4 + r/2) = 2r/(3d+2r) = 2r/6r = 1/3
check:
If Roberto has 12 cards, David has 16
After Robert gives David 6,
6/18 = 1/3
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