How many kilograms of 5% sulfuric acid solution are added to 100 kg of 50% sulfuric acid? A sulfuric acid solution with a concentration of 25% can be prepared.
在100千克浓度为50%的硫酸中再加入多少千克浓度为5%的硫酸溶液．就可以配制浓度为25%的硫酸溶液．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">100 * (1/2)</gadget>
<output>50</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 100</gadget>
<output>25</output>

<gadget id="calculator">50 - 25</gadget>
<output>25</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/4) - (1/20)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">25 / (1/5)</gadget>
<output>125</output>

<result>125</result>