Question 406986
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Hi
75 coins
Let x and (75-x) represent the dimes and nickels respectively
Question states***CENTS makes sense!
 10x + 5(75-x) = 650
Solving for x  
     5x = 275
      x = 55, number of dimes.  20 Nickles   (75-55)

CHECKING our Answer***
  550 + 100 = 650 or $6.50