(5/9) of A number is equal to (3/8) of B number, B number is 40, what is A's number?
甲数的(5/9)等于乙数的(3/8)，乙数是40，甲数是多少．
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(3/8) / (5/9)</gadget>
<output>27/40 = around 0.675</output>

<gadget id="calculator">40 * (27/40)</gadget>
<output>27</output>

<result>27</result>