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Math Help - Balancing Coins

  1. #1
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    Balancing Coins

    You have 22 coins which all weigh the same and 2 coins that are heavier than the rest, but equal in weight to each other. You have a balance that can compare two groups of coins. What is the smallest number of weighings necessary to find the two heavy coins?
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  2. #2
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    This is what I have so far....

    We know we have 24 coins in all, but should I make two or three piles to weigh? Should I take two piles of 12 or three piles of 8? And where do I go from here?

    Any insight would be nice....thank you in advance!
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