A liquid medicine is prepared by mixing medicine powder and water at a ratio of 1:80. If 5 grams of medicine powder is used, how many grams of water need to be added to make this medicine.
一种药水由药粉与水按1：80配制而成，用5克药粉，需要加水多少克才能配制成这种药水．
<gadget id="calculator">1 / 80</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">5 / (1/80)</gadget>
<output>400</output>

<result>400</result>