A rope is 10 meters long, 2 meters are used up, what is the rest of the total length?
一条绳子长10米，用去2米，剩下的占全长的多少．
<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">8 / 10</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>