The perimeter of a rectangle is 10 meters and the width is 2/3 of the length. What is the area of the rectangle in square meters?
长方形的周长是10米，宽是长的(2/3)，这个长方形的面积是多少平方米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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

<result>6</result>