There are two kinds of candies in a pile, among which the soft candy accounts for (9/20), and after adding 16 hard candies, the soft candy only accounts for (1/4) of the total of the two kinds of candies. So, how many pieces of fudge are there in this pile?
有两种糖放成一堆，其中软糖占(9/20)，再放入16块硬糖后，软糖只占两种糖总数的(1/4)．那么，这堆糖中软糖有多少块？
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">11 / 9</gadget>
<output>11/9 = around 1.222222</output>

<gadget id="calculator">3 - (11/9)</gadget>
<output>16/9 = around 1.777778</output>

<gadget id="calculator">16 / (16/9)</gadget>
<output>9</output>

<result>9</result>