For a rectangle, if its length is reduced by 10 decimeters or its width is reduced by 8 decimeters, its area will be reduced by 160 square decimeters. Find the area of the original rectangle.
一个长方形，如果长减少10分米，或它的宽减少8分米，它的面积都会减少160平方分米．求这长方形原来的面积．
<gadget id="calculator">160 / 8</gadget>
<output>20</output>

<gadget id="calculator">160 / 10</gadget>
<output>16</output>

<gadget id="calculator">20 * 16</gadget>
<output>320</output>

<result>320</result>