The Young Pioneers participated in the tree planting activity, and completed 55% of the activities on the first day, and planted 20 fewer trees on the second day than the first day, and just finished planting in two days. How many trees did you plan to plant?
少先队员参加植树活动，第一天完成55%，第二天比第一天少栽20棵，两天刚好栽完．原计划栽树多少棵？
<gadget id="calculator">55 / 100</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">(11/20) * 2</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(11/10) - 1</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">20 / (1/10)</gadget>
<output>200</output>

<result>200</result>