12 meters have been used up for a ribbon, and there are 8 meters left. What is used is the remaining amount.
一根彩带用去了12米，还剩8米，用去的是剩下的多少．
<gadget id="calculator">12 / 8</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>