The perimeter of a rectangle is 40 decimeters, and the known width is long (1/4), what is the width of this rectangle in decimeters?
一个长方形的周长是40分米，已知宽是长的(1/4)，这个长方形的宽是多少分米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">40 / 2 / (5/4)</gadget>
<output>16</output>

<gadget id="calculator">16 * (1/4)</gadget>
<output>4</output>

<result>4</result>