Page 79 of the first volume of the excellent mathematics learning plan for the sixth grade has been strengthened and improved.

Suppose the weight of oil is x kilograms, then the weight of barrel is (50-x) kilograms.

According to "After using 40%, the remaining oil drum weighs 30.8kg", it can be known that engine oil is used, so the reduced weight is 0.4xkg.. Column equation:

50-40%x=30.8

Find x = 48kg.

So the weight of the bucket = 50-48 = 2kg.

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