If the adjacent sides of the rectangle are increased by (1/4), how much will the area of the resulting rectangle increase from the original.
长方形相邻两边各增加(1/4)，所得的长方形的面积比原来增加了多少．
<gadget id="calculator">25 / 16</gadget>
<output>25/16 = around 1.5625</output>

<gadget id="calculator">(25/16) - 1</gadget>
<output>9/16 = around 0.5625</output>

<result>9/16 = around 0.5625</result>