Uncle Li sold 78 boxes of apples, each weighing 25 kilograms. How many kilograms were sold in total?
李叔叔卖了78箱苹果，每箱25千克．一共卖了多少千克？
<gadget id="calculator">25 * 78</gadget>
<output>1_950</output>

<result>1_950</result>