The worker picks 400 boxes of apples on the first day, and each box weighs 25 kilograms. The number of apples picked on the second day is the same as that on the first day. How many kilograms of apples are picked in two days?
工人第一天摘苹果400箱，每箱重25千克，第二天摘的苹果和第一天同样多，两天共摘苹果多少千克？
<gadget id="calculator">25 * 400 * 2</gadget>
<output>20_000</output>

<result>20_000</result>