question: James has 6 more candies than Robert. John has twice as many candies as Robert. If John has 54 candies, how many more candies does John have than James?
answer: Robert has 54/2 = <<54/2=27>>27 candies.
  James has 27+6 = <<27+6=33>>33 candies.
  John has 54-33= <<54-33=21>>21 more candies than James.
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