The school participated in the tree planting activity. On the first day, 3/5 of the tasks were completed, and on the second day, 3/4 of the remaining tasks were completed. On the third day, 60 trees were planted, and 40% of the tasks were completed. The school originally planned How many trees to plant?
学校参加植树活动，第一天完成全部任务的(3/5)，第二天完成余下任务的(3/4)，第三天种了60棵树，结果超额40%完成任务，学校原来计划植树多少棵？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(2/5) * (3/4)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/5) - (3/5) - (3/10)</gadget>
<output>-1/2 = around -0.5</output>

<gadget id="calculator">1 + (-1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">60 / (1/2)</gadget>
<output>120</output>

<result>120</result>