string of colorful flags has 53 sides in total, arranged in the order of 1 red, 2 yellow and 1 green. What fraction of the yellow bunting is the red bunting?
一串彩旗共53面，按1红2黄1绿的顺序排列．黄色彩旗是红色彩旗的几分之几？
<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<gadget id="calculator">13 + 1</gadget>
<output>14</output>

<gadget id="calculator">26 / 14</gadget>
<output>13/7 = around 1.857143</output>

<result>13/7 = around 1.857143</result>