In the brine containing 30% salt, add 4 grams of salt and 16 grams of water, and the salt content of the salt water obtained after mixing is less than
在含盐30%的盐水中，再加入4克盐和16克水，混合后得到的盐水含盐率小于多少
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>