A piece of wood is 8 meters long, if (5/8) is used up, how many meters are left?
一根木料长8米，用去(5/8)，还剩多少米．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">8 * (3/8)</gadget>
<output>3</output>

<result>3</result>