The area of a rectangle is 80 square meters. If the width remains the same and the length is tripled, what is the area after the extension?
一个长方形的面积是80平方米，若宽不变，长扩大到原来的3倍，扩建后的面积是多少平方米．
<gadget id="calculator">80 * 3</gadget>
<output>240</output>

<result>240</result>