question: Harry slept 9 hours last night. His friend James slept only 2/3 of what Harry slept. How many more hours did Harry sleep than James?
answer: James slept 9 hours * 2/3 = <<9*2/3=6>>6 hours.
  So, Harry slept 9 - 6 = <<9-6=3>>3 hours more than James.
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