(2/3) of a number is 60, what is 40% of this number.
一个数的(2/3)是60，这个数的40%是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">60 / (2/3)</gadget>
<output>90</output>

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

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

<result>36</result>