Yunshan Primary School plans to complete a batch of tree planting tasks this year. The first time they planted 2/5 of the plan, the second time they planted 25% of the plan, and the third time they planted 35 trees, just in time to complete the plan. How many trees to plant?
云山小学计划今年完成一批植树任务，第一次种了计划的(2/5)，第二次种了计划的25%，第三次种了35棵，正好完成计划，该小学今年计划种树多少棵？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (2/5) - (1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">35 / (7/20)</gadget>
<output>100</output>

<result>100</result>