Question
Pierre buys a coat, a skirt and a sweater. The average cost of these items is $57. The cost of the sweater is four times the total cost of the coat and the skirt. If the coat costs $15, find the difference in cost between the skirt and the sweater.
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Pierre buys a coat, a skirt and a sweater. The average cost of these items is $57. The cost of the sweater is four times the total cost of the coat and the skirt. If the coat costs $15, find the difference in cost between the skirt and the sweater.