A cuboid with a side length of 5 decimeters measured from the inside is filled with oil. If the oil weighs 0.4 kg per liter, how much does the tank weigh?
一个从里面量棱长为5分米的正方体的油箱装满油，如果每升油重0.4千克，这箱油重多少千克？
<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<gadget id="calculator">0.4 * 125</gadget>
<output>50</output>

<result>50</result>