If a pesticide and water are prepared into a potion at a ratio of 1:2000, how many kilograms of this pesticide should be placed in 1500 kilograms of water?
把一种农药和水按1：2000的比例配制成药水，在1500千克水中，应放这种农药多少千克？
<gadget id="calculator">1 / 2_000</gadget>
<output>1/2_000 = around 0.0005</output>

<gadget id="calculator">1_500 * (1/2_000)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>