The compartment of a coal truck is a cuboid. Measured from the inside, the bottom area is 4 square meters, and the height of the coal loaded is 1.5 meters. If each cubic meter of coal weighs 1.5 tons, how many tons of coal does this coal truck load?
一辆运煤车的车厢是长方体．从里面量，底面积是4平方米，装的煤高1.5米．如果每立方煤重1.5吨，这辆运煤车大约装煤多少吨？
<gadget id="calculator">4 * 1.5 * 1.5</gadget>
<output>9</output>

<result>9</result>