A piece of iron wire is 5 meters long, cut each time (1/4), after cutting 4 times, how many meters are left.
一根铁丝长5米，每次截下(1/4)，截4次后，剩下多少米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">5 * (1/4) * 4</gadget>
<output>5</output>

<gadget id="calculator">5 - 5</gadget>
<output>0</output>

<result>0</result>