A kind of pesticide, which is prepared by preparing liquid medicine and water according to the ratio of 1:1500. Now there are only 540 kilograms of water, how many kilograms of liquid medicine is needed to prepare this kind of pesticide?
一种农药，用药液和水按照1：1500的比例配制的而成的．现在只备有540千克的水，要配制这种农药，需要多少千克药液？
<gadget id="calculator">1 / 1_500</gadget>
<output>1/1_500 = around 0.000667</output>

<gadget id="calculator">540 * (1/1_500)</gadget>
<output>9/25 = around 0.36</output>

<result>9/25 = around 0.36</result>