A rectangular steel plate, cut down to 4 decimeters in length, becomes a square steel plate, with an area reduced by 48 square decimeters. What is the area of the original rectangular steel plate in square decimeters?
一块长方形钢板，长截下4分米后，成了一块正方形钢板，面积比原来减少了48平方分米．原来长方形钢板的面积是多少平方分米？
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<gadget id="calculator">144 + 48</gadget>
<output>192</output>

<result>192</result>