The area of a rectangle is 40 square centimeters. If the length remains the same and the width is increased to 4 times its original size, what is the area?
一个长方形的面积是40平方厘米，如果长不变，宽扩大到原来的4倍，面积是多少．
<gadget id="calculator">40 * 4</gadget>
<output>160</output>

<result>160</result>