If (8/9) of a number is (1/7) of 56, what is the number?
一个数的(8/9)是56的(1/7)，则这个数是多少．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">(1/7) / (8/9)</gadget>
<output>9/56 = around 0.160714</output>

<gadget id="calculator">56 * (9/56)</gadget>
<output>9</output>

<result>9</result>