There are three bottles of sugar water, A, B, and C, the concentration of which is 63%, 42%, and 28%, of which bottle A contains 11 kg. First mix the sugar water in bottles A and B to make the concentration 49%; then pour all the sugar water in bottle C into the mixture to obtain sugar water with a concentration of 35%. May I ask: How many kilograms of sugar water is in the original C bottle?
有甲、乙、丙三瓶糖水，浓度依次为63%，42%，28%，其中甲瓶有11千克．先将甲、乙两瓶中的糖水混和，浓度变为49%；然后把丙瓶中的糖水全部倒入混合液中，得到浓度为35%的糖水．请问：原来丙瓶有多少千克糖水？
<gadget id="calculator">49 / 100</gadget>
<output>49/100 = around 0.49</output>

<gadget id="calculator">42 / 100</gadget>
<output>21/50 = around 0.42</output>

<gadget id="calculator">(49/100) - (21/50)</gadget>
<output>7/100 = around 0.07</output>

<gadget id="calculator">63 / 100</gadget>
<output>63/100 = around 0.63</output>

<gadget id="calculator">(63/100) - (49/100)</gadget>
<output>7/50 = around 0.14</output>

<gadget id="calculator">(7/100) / (7/50)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">11 / (1/2)</gadget>
<output>22</output>

<gadget id="calculator">11 + 22</gadget>
<output>33</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">28 / 100</gadget>
<output>7/25 = around 0.28</output>

<gadget id="calculator">(7/20) - (7/25)</gadget>
<output>7/100 = around 0.07</output>

<gadget id="calculator">(49/100) - (7/20)</gadget>
<output>7/50 = around 0.14</output>

<gadget id="calculator">33 / (1/2)</gadget>
<output>66</output>

<result>66</result>