(2/3) of a number is 6, what is 40% of this number?
一个数的(2/3)是6，这个数的40%是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6 / (2/3)</gadget>
<output>9</output>

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

<gadget id="calculator">9 * (2/5)</gadget>
<output>18/5 = around 3.6</output>

<result>18/5 = around 3.6</result>