To paint a rectangular publicity board with a length of 6 meters and a width of 3 meters, 500 grams of paint is used per square meter. How many kilograms of paint are needed to finish painting?
给一块长是6米，宽是3米的长方形的宣传板刷油漆，每平方米要用油漆500克，需要用多少千克的油漆才能刷完？
<gadget id="calculator">500 / 1_000</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6 * 3 * (1/2)</gadget>
<output>9</output>

<result>9</result>