Mix 10 grams of 5% salt water with 90 grams of 10% salt water, what is the concentration of the salt water after mixing?
将10克5%的盐水和90克10%的盐水混合，混合后盐水的浓度为多少．
<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">90 * (1/10)</gadget>
<output>9</output>

<gadget id="calculator">(1/2) + 9</gadget>
<output>19/2 = around 9.5</output>

<gadget id="calculator">(19/2) / 100</gadget>
<output>19/200 = around 0.095</output>

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

<gadget id="calculator">(19/200) * 1</gadget>
<output>19/200 = around 0.095</output>

<result>19/200 = around 0.095</result>