The original area of a rectangle is 18 square meters. If the length remains the same and the width is increased by 4 times, what is the area in square meters?
一个长方形原来的面积是18平方米，如果长不变，宽扩大4倍，面积是多少平方米．
<gadget id="calculator">18 * 4</gadget>
<output>72</output>

<result>72</result>