A's number (3/5) is B's (5/6), B's number is 18, what is A's number?
甲数的(3/5)是乙数的(5/6)，乙数是18，甲数是多少．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">(5/6) / (3/5)</gadget>
<output>25/18 = around 1.388889</output>

<gadget id="calculator">18 * (25/18)</gadget>
<output>25</output>

<result>25</result>