20% of a number is 3 less than its (1/3), what is this number?
一个数的20%比它的(1/3)少3，这个数是多少？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) - (1/5)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">3 / (2/15)</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>