Katie bought 4 sweaters that cost the same amout and 1 skirt that cost $20.the items she bought cost a total of $160 before tax was added.what was the cost of each sweater

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The answer would be each sweater costed $35. 

Total= $160 
            -$20 (for the skirt)
          ______________
              =$140 divided by 4 for each sweater = $35