Add 50 grams of water to 450 grams of salt water with a salt content of 10%, what is the salt content of the new salt water?
在含盐率10%的450克盐水中，加入50克水，新盐水的含盐率是多少
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">450 + 50</gadget>
<output>500</output>

<gadget id="calculator">(1/10) / 500</gadget>
<output>1/5_000 = around 0.0002</output>

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

<gadget id="calculator">450 * (1/5_000) * 1</gadget>
<output>9/100 = around 0.09</output>

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