(3/5) of A number is equal to (2/3) of B number, B number is 18, what is A's number?
甲数的(3/5)等于乙数的(2/3)，乙数是18，甲数是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(2/3) / (3/5)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">18 * (10/9)</gadget>
<output>20</output>

<result>20</result>