What is (2/3) of (3/5) of 30?
30的(3/5)是多少的(2/3)．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/5) / (2/3)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">30 * (9/10)</gadget>
<output>27</output>

<result>27</result>