50 small trees are planted equidistantly on one side of a road. The distance between every two small trees is (9/7) meters. How long is the road in meters?
在一条马路的一侧等距离地栽了50棵小树，每两棵小树之间的距离是(9/7)米，这条马路长多少米．
<gadget id="calculator">50 - 1</gadget>
<output>49</output>

<gadget id="calculator">9 / 7</gadget>
<output>9/7 = around 1.285714</output>

<gadget id="calculator">49 * (9/7)</gadget>
<output>63</output>

<result>63</result>