A barrel of salad oil has a net weight of 2,500 grams. After half of the oil is used, there are 1,300 grams left in the barrel. How many grams does the barrel weigh?
一桶色拉油，油净重2500克，用去一半后，连桶还剩1300克，桶重多少克？
<gadget id="calculator">2_500 / 2</gadget>
<output>1_250</output>

<gadget id="calculator">1_300 - 1_250</gadget>
<output>50</output>

<result>50</result>