The playground of Chengguan Primary School is 35 meters long and 30 meters wide. After expansion, the length is doubled and the width increased to 50 meters. How many square meters is the playground after the expansion?
城关小学操场长35米，宽30米，扩建后，长是原来的2倍，宽增加到50米，扩建后操场的面积是多少平方米？
<gadget id="calculator">35 * 2 * 50</gadget>
<output>3_500</output>

<result>3_500</result>