There are 600 grams of salt water with a concentration of 20% and 400 grams of salt water with a concentration of 5%. Now take the same amount of salt water from the other side so that the concentration of the two salt water becomes the same. How many grams of salt water are taken from the two salt water? equal exchange?
有浓度为20%的600克盐水和浓度为5%的400克盐水，现在分别从对方取等量的盐水后使得两种盐水的浓度变成一样，从这两种盐水分别取出多少克盐水进行等量交换的？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">600 * (1/5)</gadget>
<output>120</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">400 * (1/20)</gadget>
<output>20</output>

<gadget id="calculator">20 + 120</gadget>
<output>140</output>

<gadget id="calculator">600 + 400</gadget>
<output>1_000</output>

<gadget id="calculator">140 / 1_000</gadget>
<output>7/50 = around 0.14</output>

<gadget id="calculator">600 * (7/50)</gadget>
<output>84</output>

<gadget id="calculator">120 - 84</gadget>
<output>36</output>

<gadget id="calculator">(1/5) - (1/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 * (3/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">36 / (3/20)</gadget>
<output>240</output>

<result>240</result>