The product of a number and (6/7) is 1, what is the reciprocal of this number.
一个数与(6/7)的乘积是1，这个数的倒数是多少．
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>