On a 1:600 drawing, the area of a square vegetable plot is 25 square centimeters. What is the actual area of the vegetable field in square meters?
在一幅1：600的图纸上，一块正方形菜地面积是25平方厘米．这块菜地的实际面积是多少平方米．
<gadget id="calculator">1 / 600</gadget>
<output>1/600 = around 0.001667</output>

<gadget id="calculator">5 / (1/600) / 100</gadget>
<output>30</output>

<gadget id="calculator">30 * 30</gadget>
<output>900</output>

<result>900</result>