A rectangular experimental site is 70 meters long and 50 meters wide. If the width is increased by 3 meters, how many square meters will the area be increased?
一块长方形实验地，长是70米，宽是50米，如果把宽增加3米，面积就会增加多少平方米？
<gadget id="calculator">70 * 3</gadget>
<output>210</output>

<result>210</result>