Add 4 grams of salt and 12 grams of water to 25% salt water, what is the percentage of salt in the salt water?
在含盐25%的盐水中，加入4克盐和12克水，这时盐水含盐百分比是等于多少
<gadget id="calculator">12 + 4</gadget>
<output>16</output>

<gadget id="calculator">4 / 16</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) * 1</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>