In order to prevent Influenza A, the school doctor mixes the medicine powder and water into a disinfectant according to the ratio of 1:500. The existing medicine powder is 50 grams, how many grams of water is needed.
为预防甲流感，校医按1：500把药粉和水配制成消毒液，现有药粉50克，需要用水多少克．
<gadget id="calculator">50 * 500</gadget>
<output>25_000</output>

<result>25_000</result>