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Andrew has six fewer coins than Casey. Bob has two more than twice as many coins as Andrew. Altogether, they have 504 coins. How many coins does Bob have?

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Panoyin

Andrew: x - 6
      Bob: 2x - 12
  Casey: x

  (x - 6) + (2x - 12) + x = 504
(x + 2x + x) + (-6 - 12) = 504
                        4x - 18 = 504
                            + 18   + 18
                               4x = 522
                                4       4
                                 x = 130.5

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