The number A is the reciprocal of the B number, the B number is the reciprocal of the C number, and the C number is (2/13), what is the A number
甲数是乙数的倒数，乙数是丙数的倒数，丙数是(2/13)，甲数是多少
<gadget id="calculator">2 / 13</gadget>
<output>2/13 = around 0.153846</output>

<gadget id="calculator">1 / (2/13)</gadget>
<output>13/2 = around 6.5</output>

<gadget id="calculator">1 / (13/2)</gadget>
<output>2/13 = around 0.153846</output>

<result>2/13 = around 0.153846</result>