A cube of wood, whose edge length is 5 decimeters, is known to weigh 0.4 kilograms per cubic decimeter, how much does this wood weigh in kilograms?
一个正方体木块，它的棱长是5分米，已知每立方分米重0.4千克，这个木块重多少千克？
<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

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

<result>50</result>