The precipitation in a certain area last year was 427 millimeters, which was 2/9 less than that of the previous year. How many millimeters was the precipitation in this area last year less than that of the previous year?
某地区去年降水量是427毫米，比前年减少(2/9)，这个地区去年降水量比前年少多少毫米？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (2/9)</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">427 / (7/9)</gadget>
<output>549</output>

<gadget id="calculator">549 - 427</gadget>
<output>122</output>

<result>122</result>