If the length of a rectangle is increased by 5 meters and the width remains the same, then the area is increased by 25 square meters. If the width is increased by 8 meters and the length remains the same, then the area is increased by 56 square meters. What is the area of the original rectangle?
一个长方形，如果长增加5米，宽不变，那么面积增加25平方米，如果宽增加8米，长不变，那么面积增加56平方米，原来长方形的面积是多少？
<gadget id="calculator">25 / 5</gadget>
<output>5</output>

<gadget id="calculator">56 / 8</gadget>
<output>7</output>

<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<result>35</result>