A trapezoidal billboard, the upper base is 12.5 meters, the lower base is 20 meters, and the height is 6.4 meters. If you paint this billboard, you use 0.6 kilograms of paint per square meter, how many kilograms of paint do you need?
一块梯形的广告牌，上底是12.5米，下底是20米，高6.4米．如果油漆这块广告牌，每平方米用油漆0.6千克，需要多少千克油漆？
<gadget id="calculator">12.5 + 20</gadget>
<output>32.5</output>

<gadget id="calculator">6.4 / 2</gadget>
<output>3.2</output>

<gadget id="calculator">32.5 * 3.2 * 0.6</gadget>
<output>62.4</output>

<result>62.4</result>