A 10*8 rectangle, now the length increases by 8, and the width remains the same, what is the current area
一个10*8的长方形，现在长增加8，宽不变，现在面积是多少
<gadget id="calculator">10 + 8</gadget>
<output>18</output>

<gadget id="calculator">18 * 8</gadget>
<output>144</output>

<result>144</result>