Hi, 

 x + x + x + x + 2x = 1

   6x = 1

    x = 1/6, fraction of the final grade determined by each quiz

Exam is 2(1/6) = 1/3

 1/6 + 1/6 + 1/6 + 1/6 + 1/3 = 4/6 + 1/3 = 1 

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