There are 300 grams of 13% brine in container A, and 700 grams of 7% brine in container B. Take out the same weight of brine from A and B respectively, pour the one taken from A into B, and pour the one taken out from B into In A, the concentration of salt water in containers A and B is now the same. What is the same concentration.
甲容器中有13%的盐水300克，乙容器中有7%的盐水700克，分别从甲和乙取出相同重量的盐水，把从甲取出的倒入乙中，把从乙取出的倒入甲中，现在甲、乙容器中盐水浓度相同．这个相同的浓度为多少．
<gadget id="calculator">13 / 100</gadget>
<output>13/100 = around 0.13</output>

<gadget id="calculator">300 * (13/100)</gadget>
<output>39</output>

<gadget id="calculator">7 / 100</gadget>
<output>7/100 = around 0.07</output>

<gadget id="calculator">700 * (7/100)</gadget>
<output>49</output>

<gadget id="calculator">39 + 49</gadget>
<output>88</output>

<gadget id="calculator">300 + 700</gadget>
<output>1_000</output>

<gadget id="calculator">88 / 1_000</gadget>
<output>11/125 = around 0.088</output>

<result>11/125 = around 0.088</result>