The canteen shipped 40 bags of rice and flour each, each bag of rice weighed 20 kg, and each bag of flour weighed 25 kg. How many kilograms of flour and rice are shipped from the canteen? (solution in two ways)
食堂运来大米和面粉各40袋，每袋大米重20千克，每袋面粉重25千克．食堂运来面粉和大米共多少千克？(用两种方法解)
<gadget id="calculator">20 * 40</gadget>
<output>800</output>

<gadget id="calculator">25 * 40</gadget>
<output>1_000</output>

<gadget id="calculator">800 + 1_000</gadget>
<output>1_800</output>

<result>1_800</result>