The sum of (1/5) and 40 of a number is 84, find this number.
一个数的(1/5)与40的和是84，求这个数．
<gadget id="calculator">84 - 40</gadget>
<output>44</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">44 / (1/5)</gadget>
<output>220</output>

<result>220</result>