Subject: Go get a fourth cup. Turn it and B over.
Author:
Posted on: 2015-03-27 07:48:00 UTC

Distract the person setting the rules and turn the cups over while she's not looking.

Using a hacksaw, cut the 'bottom' off Cup B, and slide a piece of thin wood covered in glue under it. Wait half an hour, and ta-da! It can now hold water.

Point out that Cup B can already hold liquid - it's got a reasonably watertight seal against the tabletop.

Point out that the starting conditions break the rule that 'all three cups MUST be right-side up'. Modify the starting condition so that this rule is met.

^_~

hS

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