Prepare a pesticide in which the ratio of medicine to water is 1:150. The existing medicine is 3 kilograms, how many kilograms of this pesticide can be prepared?
配制一种农药，其中药与水的比是1：150．现有药3千克，能配置这种农药多少千克？
<gadget id="calculator">3 * 150</gadget>
<output>450</output>

<gadget id="calculator">450 + 3</gadget>
<output>453</output>

<result>453</result>