It is a kind of pesticide, which is made up of liquid medicine and water according to the ratio of 1:50. To prepare 204 grams of this pesticide, how many grams of liquid medicine are needed?
一种农药，用药液和水按1：50配制而成．要配制这种农药204克，需要药液多少克？
<gadget id="calculator">1 + 50</gadget>
<output>51</output>

<gadget id="calculator">1 / 51</gadget>
<output>1/51 = around 0.019608</output>

<gadget id="calculator">204 * (1/51)</gadget>
<output>4</output>

<result>4</result>