A rope is 13 meters long, 8 meters are used up, and the length of the remaining rope is much less than the used one.
一根绳子长13米，用去了8米，剩下绳子的长度比用去的少多少．
<gadget id="calculator">13 - 8</gadget>
<output>5</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>