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10%

There are two identical barrels in a garden. One is full of rainwater, the other is exactly half full. The barrels weigh 86kg and 53kg, respectively. How much does an empty barrel weigh?

Fact Lab

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Interesting fact:

The Empire State Building in New York City has 85 floors of office space, the renting of which creates 37% of the architectural masterpiece's revenue. However, at 40%, the two observation decks are even more lucrative, generating roughly $110 million annually.