If the length of a rectangle decreases by (2/5) and the width increases by (4/5) meters, the area remains the same. What is the width of the original rectangle in meters?
一个长方形长减少(2/5)，宽增加(4/5)米，则面积不变，原来长方形的宽是多少米．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(4/5) / (2/5)</gadget>
<output>2</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 * (3/5)</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>