Sugar water is prepared by mixing sugar and water at a ratio of 1:19. To prepare 400 grams of this sugar water, how many grams of sugar are needed.
糖水由糖和水按1：19配制而成，要配制这种糖水400克，需要糖多少克．
<gadget id="calculator">1 + 19</gadget>
<output>20</output>

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

<gadget id="calculator">400 * (1/20)</gadget>
<output>20</output>

<result>20</result>