Add 70 grams of water to 30 grams of brine containing 16% salt, what is the concentration of the brine?
在30克含盐16%的盐水加水70克，盐水浓度变为多少？
<gadget id="calculator">16 / 100</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">30 + 70</gadget>
<output>100</output>

<gadget id="calculator">(4/25) / 100</gadget>
<output>1/625 = around 0.0016</output>

<gadget id="calculator">30 * (1/625)</gadget>
<output>6/125 = around 0.048</output>

<result>6/125 = around 0.048</result>