A number (8/9) is 72, what is this number?
一个数的(8/9)是72，这个数是多少？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">72 / (8/9)</gadget>
<output>81</output>

<result>81</result>