A triangular billboard with a base of 10m and a height of 3.4m. If the two sides of this billboard are to be painted with paint, and 0.75 kg of paint is used per square meter, how many kilograms of paint should be used for this billboard at least?
一块三角形广告牌，底是10m，高是3.4m．如果要用油漆刷这块广告牌的两面，每平方米用油漆0.75kg，这块广告牌至少要用油漆多少千克？
<gadget id="calculator">3.4 / 2</gadget>
<output>1.7</output>

<gadget id="calculator">10 * 1.7 * 2 * 0.75</gadget>
<output>25.5</output>

<result>25.5</result>