There are a bunch of candies, and the ratio of sugar A to sugar B is 9:11. After adding 16 pieces of sugar B, sugar A only accounts for 25% of the total. How many pieces of sugar A are there in this pair of candies? Candy?
有一堆糖果，其中甲种糖与乙种糖的比是9：11，再放入16块乙种糖后，甲种糖只占现在总数的25%，问这对糖果中原来有多少块甲种糖？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) / (1/4)</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>