Add 5 grams of salt and 15 grams of water to the brine containing 30% salt, what is the salt content of the brine?
在含盐30%的盐水中，加入5克盐和15克水，这时盐水的含盐率小于多少
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

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