There are 50 graphics arranged in the order of □□□○△□□□○○△…, what percentage of the graphics is ○?
有50个图形按□□□○△□□□○○△…的顺序排列，○占图形的几分之几？
<gadget id="calculator">50 / 5</gadget>
<output>10</output>

<gadget id="calculator">10 / 50</gadget>
<output>1/5 = around 0.2</output>

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