Yuanyuan asks Fangfang to guess the number: ①This number is not 0. ②The reciprocal of this number multiplied by (6/7) is equal to 1. What is this number?
圆圆让方方猜数：①这个数不是0．②这个数的倒数乘以(6/7)等于1．这个数是多少．
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 / (6/7)</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">1 / (7/6)</gadget>
<output>6/7 = around 0.857143</output>

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