There are 16 kilograms of brine with 20% salt content, how many kilograms of water need to be added to make brine with 8% salt content.
有含盐20%的盐水16千克，要配成含盐8%的盐水，需要加入多少千克水．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">8 / 100</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">(1/5) / (2/25)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">16 * (5/2)</gadget>
<output>40</output>

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

<result>24</result>