Plant trees on one side of a path, planting 1 tree every 6 meters (planting at both ends), exactly 10 trees, what is the length of this path in meters?
在一条小路的一侧植树，每隔6米植1棵(两端都植)，正好植了10棵，这条小路的长度是多少米．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">6 * 9</gadget>
<output>54</output>

<result>54</result>