(4/5) of a certain number is 28, what is this number?
某数的(4/5)是28，这个数是多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">28 / (4/5)</gadget>
<output>35</output>

<result>35</result>