In 2011, the Inner Mongolia Autonomous Region completed control of 6.5 million mu of soil erosion. Accounting for (1/5) of the total tasks during the "Twelfth Five-Year Plan" period, in the remaining four years of the "Twelfth Five-Year Plan", how many acres of governance area will the Inner Mongolia Autonomous Region complete?
2011年，内蒙占自治区完成治理水土流失面积650万亩．占"十二五"期间总任务的(1/5)，在"十二五"的其余四年内，内蒙古自治区还要完成多少万亩的治理面积？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">650 / (1/5)</gadget>
<output>3_250</output>

<gadget id="calculator">3_250 - 650</gadget>
<output>2_600</output>

<result>2_600</result>