If a wire is folded in half, and then folded in half again, it will be 500 meters long. How long is the wire in meters?
把一根铁丝对折、再对折后，长500米，这根铁丝原来长多少米？
<gadget id="calculator">500 * 4</gadget>
<output>2_000</output>

<result>2_000</result>