23 piglets are shipped back from the pig farm, each weighing 30 kilograms. How many kilograms do these piglets weigh in total?
养猪场运回23头小猪，每头重30千克，这些小猪一共重多少千克？
<gadget id="calculator">30 * 23</gadget>
<output>690</output>

<result>690</result>