If 3 grams of salt and 7 grams of water are added to 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，加入3克盐和7克水，这时盐水的含盐率等于多少
<gadget id="calculator">3 + 7</gadget>
<output>10</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

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