Observe the following set of numbers: (1/3), (1/2), (5/9), (7/12), (3/5), (11/18)...then the 30th in this set of numbers What is the number.
观察下列一组数：(1/3)，(1/2)，(5/9)，(7/12)，(3/5)，(11/18)…则这组数中的第30个数是多少．
<gadget id="calculator">2 * 30</gadget>
<output>60</output>

<gadget id="calculator">60 - 1</gadget>
<output>59</output>

<gadget id="calculator">3 * 30</gadget>
<output>90</output>

<gadget id="calculator">59 / 90</gadget>
<output>59/90 = around 0.655556</output>

<result>59/90 = around 0.655556</result>