For disinfection in public places, use 84 disinfectant and water at a ratio of 1:300 to make disinfection water. Now 20 ml of 84 disinfectant has been poured out. How many liters of water are needed to make suitable disinfection water?
公共场所消毒，用84消毒液和水按1：300配制成消毒用水，现已倒出84消毒液20毫升，需要多少升水才能配制成合适的消毒用水？
<gadget id="calculator">1 / 300</gadget>
<output>1/300 = around 0.003333</output>

<gadget id="calculator">0.02 / (1/300)</gadget>
<output>6</output>

<result>6</result>