The sports shoes of type A are 297 yuan/pair, and the sports shoes of type B are 170 yuan/pair. To buy several pairs of these two kinds of shoes, the total payment is 3353 yuan. What is the difference between the purchased A type of sports shoes and B type of sports shoes?
运甲种动鞋297元/双，乙种运动鞋170元/双，买这两种鞋若干双，共付3353元．买的甲种运动鞋与乙种运动鞋相差多少双．
<gadget id="calculator">9 - 4</gadget>
<output>5</output>

<result>5</result>