The length of a rectangle is 15 decimeters and the width is 10 decimeters. If the largest square is subtracted from this rectangle in centimeters, what is the remaining area?
一个长方形长是15分米，宽是10分米，从这个长方形厘米减去一个最大的正方形，剩余的面积是多少．
<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">150 - 100</gadget>
<output>50</output>

<result>50</result>