Paint three triangular decorative wooden boards with a base of 5 meters and a height of 4 meters. If the paint is used on both sides of the front and back sides, if 0.8 kg of paint is used per square meter, how many kilograms of paint will be used to finish painting these boards?
将三块底5米，高4米的三角形装饰木板，正反两面刷上油漆，若每平方米用油漆0.8千克，刷完这些木板要用多少千克油漆？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">5 * 2 * 2 * 0.8</gadget>
<output>16</output>

<result>16</result>