(4/7) of a number is 84, what is this number?
一个数的(4/7)是84，这个数是多少？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">84 / (4/7)</gadget>
<output>147</output>

<result>147</result>