40% of a number is 20% less than 3.6, what is this number?
一个数的40%比3.6少20%，这个数是多少？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(4/5) / (2/5)</gadget>
<output>2</output>

<gadget id="calculator">3.6 * 2</gadget>
<output>7.2</output>

<result>7.2</result>