A box of eggs weighs 25 kilograms, and a box of duck eggs weighs 30 kilograms. The store buys 20 boxes of eggs and 20 boxes of duck eggs. How many kilograms of chicken and duck eggs are purchased in total?
一箱鸡蛋重25千克，一箱鸭蛋重30千克，商店购进鸡蛋、鸭蛋各20箱，购进鸡、鸭蛋共多少千克？
<gadget id="calculator">25 + 30</gadget>
<output>55</output>

<gadget id="calculator">55 * 20</gadget>
<output>1_100</output>

<result>1_100</result>