A parallelogram plank has a base of 12 meters and a height of 6 meters. If both sides are painted with paint, 1 kilogram of paint can cover 3 square meters, at least how many kilograms of paint should be prepared?
一块平行四边形木板，底12米，高6米．如果正反两面都刷上油漆，1千克油漆可涂3平方米，至少要准备多少千克油漆？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">12 * 6 * (2/3) * 1</gadget>
<output>48</output>

<result>48</result>