There are 600 grams of salt water with a concentration of 5%, and several grams are poured out of it, and then the same quality of water is added, and after stirring evenly, it becomes salt water with a concentration of 1%. How many grams of salt water poured out.
有600克浓度为5%的食盐水，从中倒出若干克，再加入相同质量的水，搅拌均匀后成为浓度为1%的食盐水．倒出的食盐水有多少克．
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">600 * (1/20)</gadget>
<output>30</output>

<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">600 * (1/100)</gadget>
<output>6</output>

<gadget id="calculator">30 - 6</gadget>
<output>24</output>

<gadget id="calculator">24 / (1/20)</gadget>
<output>480</output>

<result>480</result>