(3/7) of a number is 27, what is (1/9) of it.
一个数的(3/7)是27，它的(1/9)是多少．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">27 / (3/7)</gadget>
<output>63</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">63 * (1/9)</gadget>
<output>7</output>

<result>7</result>