20 trucks of cement are transported to the construction site, each truck has 45 bags, and each bag of cement weighs 50 kg. How many kilograms of cement was shipped in total?
建筑工地运来20车水泥，每车45袋，每袋水泥重50千克．一共运来水泥多少千克？
<gadget id="calculator">45 * 20</gadget>
<output>900</output>

<gadget id="calculator">50 * 900</gadget>
<output>45_000</output>

<result>45_000</result>