Human: 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? Assistant: 
How many candies does Robert have? ** Robert has 54/2 = <<54/2=27>>27 candies.
How many candies does James have? ** James has 27+6 = <<27+6=33>>33 candies.
How many more candies does John have than James? ** John has 54-33= <<54-33=21>>21 more candies than James.
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