Make a cuboid wooden box with a length of 15 decimeters, a width of 10 decimeters, and a height of 12 decimeters, and paint the outside of it (the bottom surface is not painted). If 4 kg of paint is used per square meter, how many kg of paint should be used to paint this wooden box?
做一个长15分米，宽10分米，高12分米的长方体木箱，把它的外面涂上油漆(底面不涂)．如果每平方米用油漆4千克，涂这个木箱要用油漆多少千克？
<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<gadget id="calculator">15 * 12 * 2</gadget>
<output>360</output>

<gadget id="calculator">10 * 12 * 2</gadget>
<output>240</output>

<gadget id="calculator">150 + 360 + 240</gadget>
<output>750</output>

<gadget id="calculator">750 / 100</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(15/2) * 4</gadget>
<output>30</output>

<result>30</result>