There is a rectangular playground, 60 meters long and 50 meters wide. Now it is necessary to expand the playground, increasing the length by 30 meters and the width by 20 meters. What is the size of the playground after the expansion?
有一块长方形操场，长60米，宽50米．现在要扩建这个操场，长增加30米，宽增加20米．扩建后的操场面积是多少？
<gadget id="calculator">60 + 30</gadget>
<output>90</output>

<gadget id="calculator">50 + 20</gadget>
<output>70</output>

<gadget id="calculator">90 * 70</gadget>
<output>6_300</output>

<result>6_300</result>