Guangming Village planted more trees this year than last year (2/9). This year, 220 trees were planted. How many trees were planted last year?
光明村今年比去年多植树(2/9)，今年植树220棵，去年植树多少棵？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 + (2/9)</gadget>
<output>11/9 = around 1.222222</output>

<gadget id="calculator">220 / (11/9)</gadget>
<output>180</output>

<result>180</result>