There are three kinds of brines A, B, and C. Mix A and B at a ratio of 2:1 to obtain brine with a concentration of 13%; mix A and B with a ratio of 1:2 to obtain brine with a concentration of 14%. brine. If the ratio of A, B, and C is 1:1:3, and the concentration of the mixed brine is 10.2%, what is the concentration of brine C?
有A、B、C三种盐水，按A与B数量比为2：1混合，得到浓度为13%的盐水；按A与B的数量之比为1：2混合，得到浓度为14%的盐水．如果A、B、C数量之比为1：1：3，混合成的盐水浓度为10.2%，问盐水C的浓度是多少？
<gadget id="calculator">10.2 / 100</gadget>
<output>0.102</output>

<gadget id="calculator">13 / 100</gadget>
<output>13/100 = around 0.13</output>

<gadget id="calculator">14 / 100</gadget>
<output>7/50 = around 0.14</output>

<gadget id="calculator">(13/100) + (7/50)</gadget>
<output>27/100 = around 0.27</output>

<gadget id="calculator">(27/100) / 2</gadget>
<output>27/200 = around 0.135</output>

<gadget id="calculator">(27/200) - 0.102</gadget>
<output>0.033</output>

<gadget id="calculator">0.033 * 2</gadget>
<output>0.066</output>

<gadget id="calculator">0.066 / 3</gadget>
<output>0.022</output>

<gadget id="calculator">0.102 - 0.022</gadget>
<output>0.08</output>

<result>0.08</result>