Six trees are planted equidistantly on one side of a road, and the distance from the first tree to the fourth tree is 60 meters, so how many meters is the distance from the first tree to the last tree?
六棵树等距离地种在一条路的一侧，从第1棵到第四棵树的距离是60米，那么第一棵到最后一棵的距离有多少米．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<result>100</result>