rectangular lawn, 35 meters long. If the length is reduced by 5 meters, the shape of the remaining part becomes a square. What is the original area of the lawn in square meters?
一块长方形草地，长35米．如果把长减少5米，剩下部分的形状就变成了正方形．这块草地原来的面积是多少平方米．
<gadget id="calculator">35 - 5</gadget>
<output>30</output>

<gadget id="calculator">35 * 30</gadget>
<output>1_050</output>

<result>1_050</result>