Two identical rectangles, if their lengths are joined together to form a new rectangle, the circumference will be 10 cm longer than the original rectangle; if their widths are joined together, the new rectangle will have a circumference of The length is 16 cm longer than the original rectangle. Find the area of the original rectangle.
两个完全一样的长方形，如果把他们的长连在一起，拼成一个新的长方形，周长比原来的长方形增加了10厘米；如果把他们的宽连在一起，拼成的新长方形，周长比原来的一个长方形增加了16厘米．求原来的长方形的面积．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

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

<result>40</result>