A cuboid water tank is 12 decimeters long, 5 decimeters high and 8 decimeters high. If its exterior is painted, use 0.25 kg of paint per square meter. How many kilograms of paint do you need to paint this tank?
一个长方体水箱，长12分米，5分米，高8分米．如果把它的外表刷漆，每平方米用油漆0.25千克．涂这个水箱要用油漆多少千克？
<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<gadget id="calculator">12 * 8</gadget>
<output>96</output>

<gadget id="calculator">5 * 8</gadget>
<output>40</output>

<gadget id="calculator">60 + 96 + 40</gadget>
<output>196</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">196 * (1/50) * 0.25</gadget>
<output>0.98</output>

<result>0.98</result>