The price of a woolen sweater is 170 yuan, and the price of a coat is three times that of a woolen sweater. How much more expensive is the price of a coat than a woolen sweater?
一件羊毛衫的价钱是170元，大衣的价钱是羊毛衫3倍，大衣的价钱比羊毛衫贵多少钱？
<gadget id="calculator">170 * 3</gadget>
<output>510</output>

<gadget id="calculator">510 - 170</gadget>
<output>340</output>

<result>340</result>