In a square land, 15 meters on one side and 10 meters on the other side are used for greening, and the remaining area is reduced by 1350 square meters compared with the original one. What was the original area of the land in square meters?
一块正方形地，一边划出15米，另一边划出10米搞绿化，剩下的面积比原来减少了1350平方米．这块地原来的面积是多少平方米？
<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<gadget id="calculator">150 + 1_350</gadget>
<output>1_500</output>

<gadget id="calculator">15 + 10</gadget>
<output>25</output>

<gadget id="calculator">1_500 / 25</gadget>
<output>60</output>

<gadget id="calculator">60 * 60</gadget>
<output>3_600</output>

<result>3_600</result>