A flower bed is planted with roses, chrysanthemums and roses. The rose occupies (5/8) the area of the flower bed, more than the rose (9/16), and the rose occupies less (1/4) than the chrysanthemum. What percentage of the area of the flower bed do chrysanthemums occupy?
一个花坛，种了月季、菊花和玫瑰三种花．月季占这个花坛面积的(5/8)，比玫瑰花多占这个花坛面积的(9/16)，玫瑰花比菊花少占这个花坛面积的(1/4)．菊花占这个花坛面积的几分之几？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">9 / 16</gadget>
<output>9/16 = around 0.5625</output>

<gadget id="calculator">(5/8) - (9/16)</gadget>
<output>1/16 = around 0.0625</output>

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

<gadget id="calculator">(1/16) + (1/4)</gadget>
<output>5/16 = around 0.3125</output>

<result>5/16 = around 0.3125</result>