Question 388509
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Hi,         
       
Let x and (175 - x)represent the number of cookies and soft drinks sold respectively
Question states***
  $0.50x + $0.30(175 - x) = $65.70
solving for x
      $0.20x = $65.70 - $0.30*175
      $0.20x = $65.70- $52.50
         x = 13.20/.20
         x = 66, number of cookies sold, soft drinks, 109 were sold   (175-66)

CHECKING our Answer
 .50*66 + .30*109 = $33 + $32.70 = 65.70