A writing desk is 8 decimeters long and 5 decimeters wide. It is equipped with a glass plate as large as the desktop. What is the area of this glass plate in square decimeters
一张写字台，长8分米，宽5分米，给它配上一块与桌面同样大的玻璃板，这块玻璃板的面积是多少平方分米
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<result>40</result>