A grain processing factory is going to ship out a batch of rice, 42 bags have been filled, each bag is 50 kg, and there are 1600 kg left. How many kilograms are the batches of rice to be shipped out?
某粮食加工厂准备运出一批大米，已经装满42袋，每袋50千克，还剩1600千克．要运出的这批大米一共是多少千克？
<gadget id="calculator">42 * 50</gadget>
<output>2_100</output>

<gadget id="calculator">2_100 + 1_600</gadget>
<output>3_700</output>

<result>3_700</result>