How many grams of water must be added to dilute 30 grams of 16% salt water into 0.15% salt water?
要把30克含盐16%的盐水稀释成含盐0.15%的盐水，须加水多少克？
<gadget id="calculator">16 / 100</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">30 * (4/25)</gadget>
<output>24/5 = around 4.8</output>

<gadget id="calculator">0.15 / 100</gadget>
<output>0.0015</output>

<gadget id="calculator">(24/5) / 0.0015</gadget>
<output>3_200</output>

<gadget id="calculator">3_200 - 30</gadget>
<output>3_170</output>

<result>3_170</result>