(4/5) of a number is (2/9), what is this number?
一个数的(4/5)是(2/9)，这个数是多少．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(2/9) / (4/5)</gadget>
<output>5/18 = around 0.277778</output>

<result>5/18 = around 0.277778</result>