In a rectangular flower bed with a length of 8 meters and a width of 5 meters, the largest square-shaped Chinese rose is planted, and the rest is planted with orchids. What is the area of the orchids?
在一个长8米，宽5米的长方形花坛中种一个最大的正方形图形的月季花，剩下部分种兰花，兰花的面积是多少？
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">40 - 25</gadget>
<output>15</output>

<result>15</result>