If (2/5) of a number is 36, what is the number?
一个数的(2/5)是36，那么这个数是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">36 / (2/5)</gadget>
<output>90</output>

<result>90</result>