A bundle of wires is 50 meters long, half of it is cut off on the first day, and (9/2) meters are cut off on the second day, how many meters are left?
一捆电线长50米，第一天截去一半，第二天又截去(9/2)米，还剩下多少米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">50 * (1/2)</gadget>
<output>25</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">50 - 25 - (9/2)</gadget>
<output>41/2 = around 20.5</output>

<result>41/2 = around 20.5</result>