Two bottles of the same volume, A and B, are filled with salt water respectively. It is known that the ratio of salt to water in bottle A is 2:9, and the ratio of salt to water in bottle B is known to be 3:10. After mixing, the ratio of salt to brine is ﹚.
甲、乙两个容积相同的瓶子分别装满盐水，已知甲瓶中盐、水的比是2：9，已知乙瓶中盐、水的比是3：10，甲、乙两瓶盐水混合后，盐与盐水的比是﹙﹚．
<gadget id="calculator">2 + 9</gadget>
<output>11</output>

<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">3 + 10</gadget>
<output>13</output>

<gadget id="calculator">3 / 13</gadget>
<output>3/13 = around 0.230769</output>

<gadget id="calculator">(2/11) + (3/13)</gadget>
<output>59/143 = around 0.412587</output>

<gadget id="calculator">1 - (2/11)</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">1 - (3/13)</gadget>
<output>10/13 = around 0.769231</output>

<gadget id="calculator">(9/11) + (10/13)</gadget>
<output>227/143 = around 1.587413</output>

<gadget id="calculator">(59/143) / (227/143)</gadget>
<output>59/227 = around 0.259912</output>

<result>59/227 = around 0.259912</result>