The school carried out tree planting activities, completed the planned (5/9) on the first day, and completed the planned (3/5) on the second day. As a result, 140 more trees were planted than planned. How many trees did the school plan to plant?
学校开展植树活动，第一天完成计划的(5/9)，第二天完成计划的(3/5)，结果比计划多植树140棵，学校计划植树多少棵？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

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

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

<gadget id="calculator">(5/9) + (-2/5)</gadget>
<output>7/45 = around 0.155556</output>

<gadget id="calculator">140 / (7/45)</gadget>
<output>900</output>

<result>900</result>