If the product of a number and (15/13) is 1, what is the reciprocal of this number?
一个数和(15/13)相乘的积是1，这个数的倒数是多少
<gadget id="calculator">15 / 13</gadget>
<output>15/13 = around 1.153846</output>

<result>15/13 = around 1.153846</result>