Hi,         

Let x represent time it will take to type a 6-page paper

Question Sets Up the Proportion

  30min/.75 page = x/6 pages

Cross Multiply to solve for x

 .75x = 6*30min

    x = 6*30min/.75

    x = 240min or 4 hrs



CHECKING our Answer

   30/.75 = 40 =  240/6 = 40 

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