The total length of the three ropes is 36 meters. One of them is 4 meters shorter than the longest one and 4 meters longer than the shortest one. What is the length of the shortest one?
三根绳子共长36米，其中一根比最长的一根短4米，比最短的一根长4米，最短的一根长多少米．
<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<result>8</result>