The product of a number and its reciprocal is added to a to get (23/5), what is the reciprocal of a.
一个数与它的倒数的积加上a得(23/5)，a的倒数是多少．
<gadget id="calculator">18 / 5</gadget>
<output>18/5 = around 3.6</output>

<gadget id="calculator">1 / (18/5)</gadget>
<output>5/18 = around 0.277778</output>

<result>5/18 = around 0.277778</result>