(2/3) of the number A is (3/5) of the number B, the number B is 40, what is the number A?
甲数的(2/3)是乙数的(3/5)，乙数是40，甲数是多少．
<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">40 * (9/10)</gadget>
<output>36</output>

<result>36</result>