Pour 10 grams of 5% salt water into 40 grams of 10% salt water and mix. What is the salt content after mixing?
将10克含盐5%的盐水倒入40克10%的盐水中混合，混合后的含盐率是多少
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">10 * (1/20)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">40 * (1/10)</gadget>
<output>4</output>

<gadget id="calculator">(1/2) + 4</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">10 + 40</gadget>
<output>50</output>

<gadget id="calculator">(9/2) / 50</gadget>
<output>9/100 = around 0.09</output>

<result>9/100 = around 0.09</result>