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OK I'm back.
Alfred would have known his isn't 10, because if it were and so were batman's, then Robin would be able to deduce his is 20. This is because he sees 10 and 10. He knows 20-10=10 is not valid because Riddler wants only positive numbers. If Batman is 10, then Alfred knows his number. Batman is 50
Good job!
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Ok, this makes sense.
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I hope I didn't destroy Gotham
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