There is a rectangular board with a length of 60 cm and a width of 40 cm. If the largest square is cut off at one end of it, what is the area of the remaining board?
有一块长60厘米，宽40厘米的长方形木板，如果在它的一端剪去一个最大的正方形，剩下的木板面积是多少平方分米？
<gadget id="calculator">60 - 40</gadget>
<output>20</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 * (1/5)</gadget>
<output>8</output>

<result>8</result>