In a ratio, the product of two inner terms is 8, one of which is (4/9), and what is the other outer term.
在一个比例中，两个内项的积是8，其中一个外项是(4/9)，另一个外项是多少．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">8 / (4/9)</gadget>
<output>18</output>

<result>18</result>