A 32-meter-long iron wire, if (1/8) of it is used up, how many meters are left?
一根32米长的铁丝，用去了它的(1/8)，还剩下多少米．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">32 * (7/8)</gadget>
<output>28</output>

<result>28</result>