rope 10 meters long wraps exactly 2 times around a long table, what is the circumference of this long table in meters?
一根长10米的绳子，正好绕长桌面2周，这张长桌面的周长是多少米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>