(2/5) of a number is 50, what is this number
一个数的(2/5)是50，这个数是多少
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">50 / (2/5)</gadget>
<output>125</output>

<result>125</result>