Put 5 grams of salt and 5 grams of water in salt water with a salt content of 30%, what is the salt content of the salt water?
在含盐率30%的盐水中，放入5克盐和5克水，这时盐水的含盐率大于多少
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

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