The (4/5) of a number is 12.8, what is this number?
一个数的(4/5)是12.8，这个数是多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">12.8 / (4/5)</gadget>
<output>16</output>

<result>16</result>