There are two kinds of saline solution with a concentration of 24% and 35% in the laboratory, and now a part of each is taken out to make a saline solution with a concentration of 28%, but the experimenter accidentally reverses the amounts of the two solutions, and the resulting saline is prepared What is the concentration?
实验室有浓度为24%和35%的两种盐水溶液，现在各取出一部分想配成浓度为28%的盐水，可是实验员不小心将两种溶液的量取反了，结果配出盐水的浓度是多少？
<gadget id="calculator">24 / 100</gadget>
<output>6/25 = around 0.24</output>

<gadget id="calculator">4 * (6/25)</gadget>
<output>24/25 = around 0.96</output>

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

<gadget id="calculator">7 * (7/20)</gadget>
<output>49/20 = around 2.45</output>

<gadget id="calculator">(24/25) + (49/20)</gadget>
<output>341/100 = around 3.41</output>

<gadget id="calculator">7 + 4</gadget>
<output>11</output>

<gadget id="calculator">(341/100) / 11</gadget>
<output>31/100 = around 0.31</output>

<result>31/100 = around 0.31</result>