Fill in the numbers according to the law: (1/3), (1/2), (5/9), (7/12), (3/5), (11/18)... What is the eleventh number.
按规律填数：(1/3)、(1/2)、(5/9)、(7/12)、(3/5)、(11/18)…第十一个数是多少．
<gadget id="calculator">2 * 11</gadget>
<output>22</output>

<gadget id="calculator">22 - 1</gadget>
<output>21</output>

<gadget id="calculator">3 * 11</gadget>
<output>33</output>

<gadget id="calculator">21 / 33</gadget>
<output>7/11 = around 0.636364</output>

<result>7/11 = around 0.636364</result>