There are 12 badmintons in a tube, and 5 are used for training. How much of this badminton is left?
一筒羽毛球有12个，训练用去了5个．这筒羽毛球还剩下几分之几？
<gadget id="calculator">12 - 5</gadget>
<output>7</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<result>7/12 = around 0.583333</result>