If 50 grams of water is added to 450 grams of salt water containing 10%, what is the salt content of the new salt water?
在含盐10%的450克盐水中，再放入50克水，那么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 * (1/10)</gadget>
<output>45</output>

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

<gadget id="calculator">45 / 500</gadget>
<output>9/100 = around 0.09</output>

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

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

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