question: Alice has 6 more books than Steven. Clara has two times as many books as Steven. If Clara has 20 books, how many more books does Clara have than Alice?
answer: Steven has 20/2 = <<20/2=10>>10 books
  Alice has 10+6 = <<10+6=16>>16 books
  Clara has 20-16 = <<20-16=4>>4 more books than Alice
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