Uncle Zhang planted (4/5) hectares of watermelons this year, which is (4/9) of last year's planting area. How many hectares did Uncle Zhang plant watermelons last year?
张叔叔今年种西瓜(4/5)公顷，是去年种植面积的(4/9)，张叔叔去年种西瓜多少公顷？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(4/5) / (4/9)</gadget>
<output>9/5 = around 1.8</output>

<result>9/5 = around 1.8</result>