If the length of a rectangle is 6 cm and the width is 3 cm, if the length and width are each increased by 2 cm, the area will be increased by how many square centimeters.
一个长方形长是6厘米，宽是3厘米，长和宽各增加2厘米后，面积增加多少平方厘米．
<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">40 - 18</gadget>
<output>22</output>

<result>22</result>