piece of iron wire is 12 meters long, how many meters will it be after cutting (1/4) of it?
一根铁丝长12米，剪下它的(1/4)后是多少米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12 * (1/4)</gadget>
<output>3</output>

<gadget id="calculator">12 - 3</gadget>
<output>9</output>

<result>9</result>