After mixing 100 grams of 10% salt water with 150 grams of 20% salt water, what is the percentage of salt in the water?
含盐10%的盐水100克与含盐20%的盐水150克混合后，盐占盐水的多少．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 * (1/10)</gadget>
<output>10</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 * (1/5)</gadget>
<output>30</output>

<gadget id="calculator">10 + 30</gadget>
<output>40</output>

<gadget id="calculator">100 + 150</gadget>
<output>250</output>

<gadget id="calculator">40 / 250</gadget>
<output>4/25 = around 0.16</output>

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

<gadget id="calculator">(4/25) * 1</gadget>
<output>4/25 = around 0.16</output>

<result>4/25 = around 0.16</result>