If the length of a rectangular vegetable field with an area of 36 square meters is enlarged to four times its original size, and the width remains unchanged, what is the area of the enlarged vegetable field?
将一块面积36平方米的长方形菜地的长扩大到原来的4倍，宽不变，扩大后的菜地面积是多少？
<gadget id="calculator">36 * 4</gadget>
<output>144</output>

<result>144</result>