(2/7) of a number is 8, what is this number?
一个数的(2/7)是8，这个数是多少．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">8 / (2/7)</gadget>
<output>28</output>

<result>28</result>