A container holds 24kg of water, and now it is necessary to prepare an alcohol solution with a concentration of 25%, how many kg of pure alcohol should be added.
一个容器里盛24kg水，现在要配制浓度为25%的酒精溶液，需要加纯酒精多少kg．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">24 / (3/4)</gadget>
<output>32</output>

<gadget id="calculator">32 * (1/4)</gadget>
<output>8</output>

<result>8</result>