rectangular orchard is 400 meters long and 300 meters wide. Calculated by spraying 15 kilograms of pesticides per hectare, how many kilograms of pesticides are needed to spray this orchard once?
一块长方形的果园，长400米，宽300米，按每公顷喷洒农药15千克计算，给这个果园喷洒一次农药，一共需要多少千克农药？
<gadget id="calculator">300 / 10_000</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">400 * (3/100) * 15</gadget>
<output>180</output>

<result>180</result>