A sock knitting machine weaves 39 pairs of socks in 3 hours. According to this calculation, how many pairs of socks can the sock knitting machine work 8 hours a day?
一台织袜机3小时织袜39双，照这样计算，这台织袜机一天工作8小时，可以织袜多少双？
<gadget id="calculator">39 / 3</gadget>
<output>13</output>

<gadget id="calculator">13 * 8</gadget>
<output>104</output>

<result>104</result>