[ Arithmetic. Mental calculation, etc.]

A full milk barrel weighs 34 kg, and one filled to half - 17.5 kg. How much does the empty barrel weigh?

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How much greater is the doubled weight of a bucket filled halfway compared to the weight of a full bucket?

## Solution

The weight of the bucket is equal to the difference between the doubled weight of the bucket filled halfway (i.e., the weight of the contents + twice the weight of the bucket) and the weight of a full bucket (i.e., the weight of the bucket + the weight of the contents). Therefore, the weight of the bucket is 1 kg.

## Answer

1 kg.