Aunt Wang paid the salesperson 50 yuan, bought 5 pairs of socks, got back 31 yuan, how much is each pair of socks?
王阿姨付给售货员50元，买了5双袜子，找回31元，每双袜子多少元？
<gadget id="calculator">50 - 31</gadget>
<output>19</output>

<gadget id="calculator">19 / 5</gadget>
<output>19/5 = around 3.8</output>

<result>19/5 = around 3.8</result>