A classroom is 8 meters long, 6 meters wide, and 3.5 meters high. It is necessary to paint the walls and ceiling of the classroom. The area of doors, windows and blackboards is 22 square meters. The average amount of paint used per square meter is 0.25 kilograms. How many kilograms of paint are needed to paint this classroom? ?
一问教室长8米，宽6米，高3.5米，要粉刷教室的墙壁和天花板，门窗和黑板的面积是22平方米，平均每平方米用涂料0.25千克，粉刷这个教室共需要涂料多少千克？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 3.5</gadget>
<output>28</output>

<gadget id="calculator">6 * 3.5</gadget>
<output>21</output>

<gadget id="calculator">28 + 21</gadget>
<output>49</output>

<gadget id="calculator">49 * 2</gadget>
<output>98</output>

<gadget id="calculator">98 - 22</gadget>
<output>76</output>

<gadget id="calculator">48 + 76</gadget>
<output>124</output>

<gadget id="calculator">124 * 0.25</gadget>
<output>31</output>

<result>31</result>