After cutting out the largest square from a piece of rectangular paper, the remaining length is 60 cm. It is known that the width of the original rectangle is 15 cm. What is the area of the original rectangle in square centimeters?
一张长方形纸剪去一个最大的正方形后，长还剩60厘米，已知原来长方形的宽是15厘米，原来长方形的面积是多少平方厘米．
<gadget id="calculator">60 + 15</gadget>
<output>75</output>

<gadget id="calculator">75 * 15</gadget>
<output>1_125</output>

<result>1_125</result>