The bottom of a parallelogram billboard is 15 meters long, and the height is the bottom (2/3). If this billboard is painted, 0.6 kilograms of paint is used per square meter. How many kilograms of paint are needed at least?
一块平行四边形广告牌的底长15米，高是底的(2/3)，如果油漆这块广告牌，每平方米用油漆0.6千克，至少需要多少千克油漆？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">15 * (2/3)</gadget>
<output>10</output>

<gadget id="calculator">15 * 10 * 0.6</gadget>
<output>90</output>

<result>90</result>