What is the quotient of the difference between 640 and 280 divided by the product of 12 and 5?
640与280的差，除以12与5的积，商是多少．
<gadget id="calculator">640 - 280</gadget>
<output>360</output>

<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<gadget id="calculator">360 / 60</gadget>
<output>6</output>

<result>6</result>