A rectangle is 4 meters long and 2 meters wide. If its length is tripled and its width remains the same, what is its area?
一个长方形长4米，宽2米，若将它的长扩大3倍，宽不变，面积是多少．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<result>24</result>