Add 4 grams of salt and 16 grams of water to salt water with a salt content of 25%, what is the salt content of the salt water?
在含盐率为25%的盐水中，加入4克盐和16克的水，这时盐水的含盐率小于多少
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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