Measure the height of the bridge on the bridge. When the rope is folded in half and hangs to the water surface, there is still 8 meters left. When the rope is folded in three and hangs to the water surface, there are still 2 meters left.
在桥上测量桥高，把绳子对折后垂到水面时尚余8米，把绳子三折垂到水面时，尚余2米，绳长多少米．
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">16 - 6</gadget>
<output>10</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 + 16</gadget>
<output>36</output>

<result>36</result>