Add water to 24 kg of brine containing 15% salt to make the brine contain 9% salt, how many kg of water should be added?
在24千克含盐15%的盐水中加水使盐水含盐9%，需要加水多少千克．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">24 * (3/20)</gadget>
<output>18/5 = around 3.6</output>

<gadget id="calculator">9 / 100</gadget>
<output>9/100 = around 0.09</output>

<gadget id="calculator">(18/5) / (9/100)</gadget>
<output>40</output>

<gadget id="calculator">40 - 24</gadget>
<output>16</output>

<result>16</result>