A pesticide is prepared by mixing powder and water at a ratio of 1:200. There are 3 grams of powder, how many grams of water need to be added?
一种农药，用药粉和水按照1：200配制成，现有3克药粉，需要加水多少克？
<gadget id="calculator">3 * 200</gadget>
<output>600</output>

<result>600</result>