A conference hall has 6 identical cylindrical wooden columns, each 4 meters high, and the circumference of the base is 1.5 decimeters. If 4.5 square meters can be painted per kilogram of paint, how many kilograms are needed to paint these wooden columns?
一个会议大厅有6根同样的圆柱形木柱，每根高4米，底面周长是1.5分米．如果每千克油漆可以漆4.5平方米，漆这些木柱需要多少千克？
<gadget id="calculator">1.5 / 10</gadget>
<output>0.15</output>

<gadget id="calculator">6 / 4.5</gadget>
<output>1.333333</output>

<gadget id="calculator">0.15 * 4 * 1.333333</gadget>
<output>0.8</output>

<result>0.8</result>