A piece of square paper is folded in half, and after being folded in half again, the measurement is (16/25) square decimeters. What is the original area of this paper?
一张正方形纸，对折，再对折后，量得是(16/25)平方分米，这张纸原面积是多少平方分米？
<gadget id="calculator">16 / 25</gadget>
<output>16/25 = around 0.64</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(16/25) / (1/4)</gadget>
<output>64/25 = around 2.56</output>

<result>64/25 = around 2.56</result>