Reduce one side of the square by 30% and increase the other side by 3 meters to obtain a rectangle with the same area as the original square. So, what is the area of the original square in square meters?
把正方形的一边减少30%，另一边增加3米，得到一个长方形，它与原来的正方形的面积相等．那么，原来正方形的面积是多少平方米．
<gadget id="calculator">2.1 / 0.3</gadget>
<output>7</output>

<gadget id="calculator">7 * 7</gadget>
<output>49</output>

<result>49</result>