(3/5) of a number is 27, what is (4/9) of this number.
一个数的(3/5)是27，这个数的(4/9)是多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">27 / (3/5)</gadget>
<output>45</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">45 * (4/9)</gadget>
<output>20</output>

<result>20</result>