A kind of sugar water, prepared according to the ratio of sugar and water 1:19. If you want to prepare 250 grams of sugar water like this, how many kilograms of sugar do you need?
一种糖水，按糖和水1：19配制而成．如果要配制这样糖水250克，需要糖多少千克？
<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">(1/20) / 1_000</gadget>
<output>1/20_000 = around 0.00005</output>

<gadget id="calculator">250 * (1/20_000)</gadget>
<output>1/80 = around 0.0125</output>

<result>1/80 = around 0.0125</result>