There are 6 cuboid pillars in the hall, the bottom surface is a square with a side length of 40 cm, and the height of the pillars is 4.5 meters. Now to paint these pillars, 0.5 kg of paint is needed per square meter, how many kg of paint is needed in total?
大厅里有6根长方体柱子，底面是边长为40厘米的正方形，柱子高4.5米．现在要油漆这些柱子，每平方米需要油漆0.5千克，共需油漆多少千克？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 4.5 * 4 * 6 * 0.5</gadget>
<output>21.6</output>

<result>21.6</result>