If the largest square is subtracted from a rectangular piece of paper with a length of 25 cm and a width of 15 cm, what is the area of the remaining part?
在一张长25厘米，宽15厘米的长方形纸上减去一个最大的正方形，剩余部分的面积是多少？
<gadget id="calculator">25 * 15</gadget>
<output>375</output>

<gadget id="calculator">15 * 15</gadget>
<output>225</output>

<gadget id="calculator">375 - 225</gadget>
<output>150</output>

<result>150</result>