Question 613609
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Hi, 
There are 37 bills 
Let x and (37-x) represent the number of $5 and $1 bills respectively
Question states***total of the bills is $141.00
  5x + (37-x) = 141
     4x = 104
      x = 26, number of $5 bills.  There are 11 $1 bills

 $5*26 + $11 = $141