Mix 20 grams of brine with a salt content of 30% and 30 grams of brine with a salt content of 20%, what is the salt content of the mixed brine?
将含盐量30%的盐水20克与含盐量20%的盐水30克混合，混合后的盐水含盐量是多少．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">20 * (3/10)</gadget>
<output>6</output>

<gadget id="calculator">6 + 6</gadget>
<output>12</output>

<gadget id="calculator">20 + 30</gadget>
<output>50</output>

<gadget id="calculator">12 / 50</gadget>
<output>6/25 = around 0.24</output>

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

<gadget id="calculator">(6/25) * 1</gadget>
<output>6/25 = around 0.24</output>

<result>6/25 = around 0.24</result>