One piece of wood is 8 meters long, the other is shorter (1/4), and the other is how many meters long.
一根木料长8米，另一根比它短(1/4)，另一根长多少米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">8 * (3/4)</gadget>
<output>6</output>

<result>6</result>