A's number is 18, B's (5/9) is 40, A's number is what fraction of B's number?
甲数是18，乙数的(5/9)是40，甲数是乙数的几分之几？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">40 / (5/9)</gadget>
<output>72</output>

<gadget id="calculator">18 / 72</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>