On Arbor Day, the students in Class 6 (1) went to plant trees, and after planting 65 trees, they found that (2/7) were not planted, so how many trees should be planted in Class 6 (1) this Arbor Day?
植树节，六(一)班的同学去植树，种了65棵树后发现还有(2/7)没有种植，那么这次植树节六(一)班一共需要种多少棵树．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">65 / (5/7)</gadget>
<output>91</output>

<result>91</result>