There are 25 white rabbits and 30 gray rabbits. How many percent more gray rabbits than white rabbits?
白兔有25只，灰兔有30只．灰兔比白兔多百分之几？
<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<gadget id="calculator">5 / 25</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>