A rope is used to surround a big tree. If it is wound 10 times and there is 3 meters left, if it is wound 11 times and 1 meter is missing, then how many meters will be left after winding 8 times.
用一根绳子围大树，如果绕10圈剩下3米，如果绕11圈又缺1米，那么绕8圈则剩下多少米．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">11 - 10</gadget>
<output>1</output>

<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">40 + 3</gadget>
<output>43</output>

<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<gadget id="calculator">43 - 32</gadget>
<output>11</output>

<result>11</result>