A wire is 12 meters long, (3/4) meters are used up, how many meters are left?
一根电线长12米，用去了(3/4)米，还剩下多少米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12 - (3/4)</gadget>
<output>45/4 = around 11.25</output>

<result>45/4 = around 11.25</result>