Question
Liam buys a coat, a shirt and a sweater. The average cost of these items is $56. The cost of the sweater is four times the total cost of the coat and the shirt. If the coat costs $21, find the difference in cost between the shirt and the sweater.
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Liam buys a coat, a shirt and a sweater. The average cost of these items is $56. The cost of the sweater is four times the total cost of the coat and the shirt. If the coat costs $21, find the difference in cost between the shirt and the sweater.