Last year, the school greened the campus by 720 square meters. This year, the green area is 200 square meters less than twice that of last year. How many square meters is the green area of the school this year?
学校去年绿化校园720平方米，今年绿化面积比去年的2倍少200平方米．今年学校绿化面积是多少平方米？
<gadget id="calculator">720 * 2</gadget>
<output>1_440</output>

<gadget id="calculator">1_440 - 200</gadget>
<output>1_240</output>

<result>1_240</result>