What is the salt content of 45 kg of 10% salt water and 5 kg of water?
含盐10%的盐水45千克再加入5千克水，这时的含盐率是多少．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">45 * (1/10)</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">45 + 5</gadget>
<output>50</output>

<gadget id="calculator">(9/2) / 50</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>