80 mg of vitamin C is added to every 100 grams of water, so how many mg of vitamin C should be added to 25 kg of such water.
每100克水中添加80毫克维生素C，那么25千克这样的水需添加多少毫克的维生素C．
<gadget id="calculator">80 / 10_000</gadget>
<output>1/125 = around 0.008</output>

<gadget id="calculator">1_000_000 / 10</gadget>
<output>100_000</output>

<gadget id="calculator">(1/125) * 25 * 100_000</gadget>
<output>20_000</output>

<result>20_000</result>