Question 477578
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Hi,
Let x and y represent the number of nickels and dimes respectively
Question states***CENTS makes sense
  5x + 10y = 620
5(x-7) + 10(2y) = 885

  5x + 10y = 620
  5x + 10(2y) = 920

  -5x - 10y = -620
   5x + 10(2y) = 920
           10y = 300
             y = 30, the number of dimes. Number of nickels is 64.

CHECKING our Answer***
5(x-7) + 10(2y) = 885
5*57 + 10*60 = 285 + 600 = 885 OR $8.85