Cut off half of a rope, and then cut off the remaining half, leaving 16 meters. How long is this rope in meters?
一根绳子剪去一半，再剪去余下的一半，还剩16米．这根绳子原来长多少米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/2) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">16 / (1/4)</gadget>
<output>64</output>

<result>64</result>