The (4/7) of a number is 28, what is the correct formula for finding this number
一个数的(4/7)是28，求这个数的正确算式是多少
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">28 / (4/7)</gadget>
<output>49</output>

<result>49</result>