A sweater costs 150 yuan, and the price of the coat is three times that of the sweater. (ask questions and answer)?
一件毛衣150元，大衣的价钱是毛衣的3倍．(提出问题并解答)？
<gadget id="calculator">150 * 3</gadget>
<output>450</output>

<gadget id="calculator">450 - 150</gadget>
<output>300</output>

<result>300</result>