Grandpa Zhang has a rectangular orchard. If the length is increased by 8 meters or the width is increased by 5 meters, the area will increase by 160 square meters. So how many square meters is the original orchard?
张爷爷有一块长方形果园，如果长增加8米或者宽增加5米，面积都增加了160平方米．那么原来果园的面积是多少平方米？
<gadget id="calculator">160 / 5</gadget>
<output>32</output>

<gadget id="calculator">160 / 8</gadget>
<output>20</output>

<gadget id="calculator">32 * 20</gadget>
<output>640</output>

<result>640</result>